SOS1 inhibitors

ABSTRACT

The present invention relates to compounds that inhibit Son of sevenless homolog 1 (SOS1) activity. In particular, the present invention relates to compounds, pharmaceutical compositions and methods of use, such as methods of treating cancer using the compounds and pharmaceutical compositions of the present invention.

FIELD OF THE INVENTION

The present invention relates to compounds that inhibit Son of sevenlesshomolog 1 (SOS1) GTP-mediated nucleotide exchange. In particular, thepresent invention relates to compounds, pharmaceutical compositionscomprising the compounds and methods for use therefor.

BACKGROUND OF THE INVENTION

The Ras family comprises v-Ki-ras2 Kirsten rat sarcoma viral oncogenehomolog (KRAS), neuroblastoma RAS viral oncogene homolog (NRAS), andHarvey murine sarcoma virus oncogene (HRAS) and critically regulatescellular division, growth and function in normal and altered statesincluding cancer (see e.g., Simanshu et al. Cell, 2017. 170(1): p.17-33; Matikas et al., Crit Rev Oncol Hematol, 2017. 110: p. 1-12). RASproteins are activated by upstream signals, including receptor tyrosinekinases (RTKs), and transduce signals to several downstream signalingpathways such as the mitogen-activated protein kinase(MAPK)/extracellular signal-regulated kinases (ERK) pathway.Hyperactivation of RAS signaling is frequently observed in cancer as aresult of mutations or alterations in RAS genes or other genes in theRAS pathway. The identification of strategies to inhibit RAS and RASsignaling are predicted to be useful for the treatment of cancer andRAS-regulated disease states.

RAS proteins are guanosine triphosphatases (GTPases) that cycle betweenan inactive, guanosine diphosphate (GDP)-bound state and an activeguanosine triphosphate (GTP)-bound state. Son of sevenless homolog 1(SOS1) is a guanine nucleotide exchange factor (GEF) that mediates theexchange of GDP for GTP, thereby activating RAS proteins. RAS proteinshydrolyze GTP to GDP through their intrinsic GTPase activity which isgreatly enhanced by GTPase-activating proteins (GAPs). This regulationthrough GAPs and GEFs is the mechanism whereby activation anddeactivation are tightly regulated under normal conditions. Mutations atseveral residues in all three RAS proteins are frequently observed incancer and result in RAS remaining predominantly in the activated state(Sanchez-Vega et al., Cell, 2018. 173: p. 321-337 Li et al., NatureReviews Cancer, 2018. 18: p. 767-777). Mutations at codon 12 and 13 arethe most frequently mutated RAS residues and prevent GAP-stimulated GTPhydrolysis by blocking the interaction of GAP proteins and RAS. Recentbiochemical analyses however, demonstrated these mutated proteins stillrequire nucleotide cycling for activation based on their intrinsicGTPase activity and/or partial sensitivity to extrinsic GTPases. Assuch, mutant RAS proteins are sensitive to inhibition of upstreamfactors such as SOS1 or SHP2, another upstream signaling moleculerequired for RAS activation (Hillig, 2019; Patricelli, 2016; Lito, 2016;Nichols, 2018).

The three main RAS-GEF families that have been identified in mammaliancells are SOS, RAS-GRF and RAS-GRP (Rojas, 2011). RAS-GRF and RAS-GRPare expressed in the cells of the central nervous system andhematopoietic cells, respectively, while the SOS family is ubiquitouslyexpressed and is responsible for transducing RTK signaling. The SOSfamily comprises SOS1 and SOS2 and these proteins share approximately70% sequence identity. SOS1 appears to be much more active than SOS2 dueto the rapid degradation of SOS2. The mouse SOS2 knockout is viablewhereas the SOS1 knockout is embryonic lethal. A tamoxifen-inducibleSOS1 knockout mouse model was used to interrogate the role of SOS1 andSOS2 in adult mice and demonstrated the SOS1 knockout was viable but theSOS1/2 double knockout was not viable (Baltanas, 2013) suggestingfunctional redundancy and that selective inhibition of SOS1 may have asufficient therapeutic index for the treatment of SOS1-RAS activateddiseases.

SOS proteins are recruited to phosphorylated RTKs through an interactionwith growth factor receptor bound protein 2 (GRB2). Recruitment to theplasma membrane places SOS in close proximity to RAS and enablesSOS-mediated RAS activation. SOS proteins bind to RAS through a bindingsite that promotes nucleotide exchange as well as through an allostericsite that binds GTP-bound RAS-family proteins and increases the functionof SOS (Freedman et al., Proc. Natl. Acad. Sci, USA 2006. 103(45): p.16692-97). Binding to the allosteric site relieves steric occlusion ofthe RAS substrate binding site and is therefore required for nucleotideexchange. Retention of the active conformation at the catalytic sitefollowing interaction with the allosteric site is maintained inisolation due to strengthened interactions of key domains in theactivated state. SOS1 mutations are found in Noonan syndrome and severalcancers including lung adenocarcinoma, embryonal rhabdomyosarcoma,Sertoli cell testis tumor and granular cell tumors of the skin (seee.g., Denayer, E., et al, Genes Chromosomes Cancer, 2010. 49(3): p.242-52).

GTPase-activating proteins (GAPs) are proteins that stimulate the lowintrinsic GTPase activity of RAS family members and therefore convertsactive GTP-bound RAS proteins into inactive, GDP-bound RAS proteins(e.g., see Simanshu, D. K., Cell, 2017, Ras Proteins and theirRegulators in Human Disease). While activating alterations in the GEFSOS1 occur in cancers, inactivating mutations and loss-of-functionalterations in the GAPs neurofibromin 1 (NF-1) or neurofibromin 2 (NF-2)also occur creating a state where SOS1 activity is unopposed andactivity downstream of the pathway through RAS proteins is elevated.

Thus, the compounds of the present invention that block the interactionbetween SOS1 and Ras-family members prevent the recycling of KRas intothe active GTP-bound form and, therefore, may provide therapeuticbenefit for a wide range of cancers, particularly Ras familymember-associated cancers. The compounds of the present invention offerpotential therapeutic benefit as inhibitors of SOS1-KRas interactionthat may be useful for negatively modulating the activity of KRasthrough blocking SOS1-KRas interaction in a cell for treating variousforms of cancer, including Ras-associated cancer, SOS1-associated cancerandNFl/NF2-associated cancer.

SUMMARY OF THE INVENTION

There is a need to develop new SOS1 inhibitors that are capable ofblocking the interaction between SOS1 and Ras-family members, preventthe recycling of KRas into the active GTP-bound form and, therefore, mayprovide therapeutic benefit for a wide range of cancers, particularlyincluding Ras-associated cancers, SOS1-associated cancersandNFl/NF2-associated cancers.

In one aspect of the invention, compounds are provided represented byFormula (I):

or a pharmaceutically acceptable salt thereof, wherein:

R¹ is hydrogen, hydroxyl, C1-C6 alkyl, alkoxy, —N(R⁶)₂, —NR⁶C(O)R⁶,—C(O)N(R⁶)₂, —SO₂alkyl, —SO₂NR⁶alkyl, cycloalkyl, -Q-heterocyclyl, aryl,or heteroaryl, wherein the cycloalkyl, the heterocyclyl, the aryl, andthe heteroaryl are each optionally substituted with one or more R² orL-R2;

each Q is independently a bond, O or NR⁶;

X is N or CR⁷;

each R² is independently C1-C3 alkyl, oxo (i.e., C═O), hydroxy, halogen,cyano, hydroxyalkyl, haloalkyl, alkoxy, —C(O)N(R⁶)₂, —N(R⁶)₂, —SO₂alkyl,—NR⁶C(O)C1-C3 alkyl, —C(O)cycloalkyl, —C(O)C1-C3 alkyl,—C(O)heterocyclyl, aryl, heteroaryl or heterocyclyl, wherein thecycloalkyl, the heterocyclyl, the aryl, the heteroaryl or theheterocyclyl are each optionally substituted with one or more R¹¹;

R³ is hydrogen, C1-C6 alkyl, alkoxy, —N(R¹⁰)₂, -L-N(R¹⁰)₂, cycloalkyl,haloalkyl or heterocyclyl, wherein the C1-C6 alkyl, the cycloalkyl andthe heterocyclyl are each optionally substituted with one or more R⁹;

Y is a bond or heteroarylene;

R⁴ is aryl or heteroaryl, each optionally substituted with one or moreR⁵;

each R⁵ is independently hydroxy, halogen, cyano, hydroxyalkyl, alkoxy,C1-C3 alkyl, haloalkyl, haloalkyl-OH, —N(R⁶)₂, -L-N(R⁶)₂ or —SO₂alkyl;

L is C1-C3 alkylene;

each R⁶ is independently hydrogen, C1-C3 alkyl, haloalkyl, orcycloalkyl;

R⁷ is hydrogen, cyano, or alkoxy;

R⁸ is C1-C2 alkyl or haloC1-C2 alkyl;

each R⁹ is independently hydroxy, halogen, amino, cyano, alkoxy, orC1-C3 alkyl;

each R¹⁰ is independently hydrogen, C1-C3 alkyl or cycloalkyl;

each R¹¹ is independently C1-C3 alkyl, halogen or haloalkyl; and

R¹² is hydrogen, halogen or C1-C3 alkyl.

In another aspect of the invention, pharmaceutical compositions areprovided comprising a therapeutically effective amount of a compound ofthe present invention or a pharmaceutically acceptable salt thereof anda pharmaceutically acceptable excipient.

In yet another aspect, the invention provides methods for inhibiting theactivity of a Ras-family member by inhibiting the associaton between theRas-family member and SOS1 in a cell, comprising contacting the cellwith a compound of Formula (I). In one embodiment, the contacting is invitro. In one embodiment, the contacting is in vivo.

Also provided herein is a method of inhibiting cell proliferation, invitro or in vivo, the method comprising contacting a cell with aneffective amount of a compound of Formula (I), or a pharmaceuticallyacceptable salt thereof, or a pharmaceutical composition thereof asdefined herein.

Also provided herein are methods for treating cancer in a subject inneed thereof, the method comprising (a) determining that cancer isassociated with a Ras-family member mutation (e.g., a KRasG12C-associated cancer) (e.g., as determined using a regulatoryagency-approved, e.g., FDA-approved, assay or kit); and (b)administering to the patient a therapeutically effective amount ofcompound of Formula (I), or pharmaceutically acceptable salts orpharmaceutical compositions thereof.

Also provided herein are methods for treating cancer in a subject inneed thereof, the method comprising (a) determining that cancer isassociated with a SOS1 mutation (e.g., a SOS1-associated cancer) (e.g.,as determined using a regulatory agency-approved, e.g., FDA-approved,assay or kit); and (b) administering to the patient a therapeuticallyeffective amount of compound of Formula (I), or pharmaceuticallyacceptable salts or pharmaceutical compositions thereof.

Also provided herein are methods for treating cancer in a subject inneed thereof, the method comprising (a) determining that cancer isassociated with a NF-1 or NF-2 loss-of-function mutation (e.g., aNF1/NF2-associated cancer) (e.g., as determined using a regulatoryagency-approved, e.g., FDA-approved, assay or kit); and (b)administering to the patient a therapeutically effective amount ofcompound of Formula (I), or pharmaceutically acceptable salts orpharmaceutical compositions thereof.

Also provided herein is a use of a compound of Formula (I), or apharmaceutically acceptable salt or solvate thereof, as defined hereinin the manufacture of a medicament for the inhibition of activity ofSOS1.

Also provided herein is the use of a compound of Formula (I), or apharmaceutically acceptable salt or solvate thereof, as defined herein,in the manufacture of a medicament for the treatment of aSOS1-associated disease or disorder.

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to SOS1 inhibitors. In particular, thepresent invention relates to compounds that inhibit SOS1 activity,pharmaceutical compositions comprising a therapeutically effectiveamount of the compounds, and methods of use therefor.

Definitions

Unless defined otherwise, all technical and scientific terms used hereinhave the same meaning as is commonly understood by one of skill in theart to which this invention belongs. All patents, patent applications,and publications referred to herein are incorporated by reference to theextent they are consistent with the present disclosure. Terms and rangeshave their generally defined definition unless expressly definedotherwise.

For simplicity, chemical moieties are defined and referred to throughoutprimarily as univalent chemical moieties (e.g., alkyl, aryl, etc.).Nevertheless, such terms may also be used to convey correspondingmultivalent moieties under the appropriate structural circumstancesclear to those skilled in the art. For example, while an “alkyl” moietygenerally refers to a monovalent radical (e.g. CH₃—CH₂—), in certaincircumstances a bivalent linking moiety can be “alkyl,” in which casethose skilled in the art will understand the alkyl to be a divalentradical (e.g., —CH₂—CH₂—), which is equivalent to the term “alkylene.”(Similarly, in circumstances in which a divalent moiety is required andis stated as being “aryl,” those skilled in the art will understand thatthe term “aryl” refers to the corresponding divalent moiety, arylene.)All atoms are understood to have their normal number of valences forbond formation (i.e., 4 for carbon, 3 for N, 2 for O, and 2, 4, or 6 forS, depending on the oxidation state of the S).

As used herein, “KRas G12C” refers to a mutant form of a mammalian KRasprotein that contains an amino acid substitution of a cysteine for aglycine at amino acid position 12. The assignment of amino acid codonand residue positions for human KRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01116: Variant p.Gly12Cys.

As used herein, “KRas G12D” refers to a mutant form of a mammalian KRasprotein that contains an amino acid substitution of an aspartic acid fora glycine at amino acid position 12. The assignment of amino acid codonand residue positions for human KRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01116: Variant p.Gly12Asp.

As used herein, “KRas G12S” refers to a mutant form of a mammalian KRasprotein that contains an amino acid substitution of a serine for aglycine at amino acid position 12. The assignment of amino acid codonand residue positions for human KRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01116: Variant p.Gly12Ser.

As used herein, “KRas G12A” refers to a mutant form of a mammalian KRasprotein that contains an amino acid substitution of an alanine for aglycine at amino acid position 12. The assignment of amino acid codonand residue positions for human KRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01116: Variant p.Gly12Ala.

As used herein, “KRas G13D” refers to a mutant form of a mammalian KRasprotein that contains an amino acid substitution of an aspartic acid fora glycine at amino acid position 13. The assignment of amino acid codonand residue positions for human KRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01116: Variant p.Gly13Asp.

As used herein, “KRas G13C” refers to a mutant form of a mammalian KRasprotein that contains an amino acid substitution of a cysteine for aglycine at amino acid position 13. The assignment of amino acid codonand residue positions for human KRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01116: Variant p.Gly13Cys.

As used herein, “KRas Q61L” refers to a mutant form of a mammalian KRasprotein that contains an amino acid substitution of a leucine for aglutamine at amino acid position 41. The assignment of amino acid codonand residue positions for human KRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01116: Variant p.Gln61Leu.

As used herein, “KRas A146T” refers to a mutant form of a mammalian KRasprotein that contains an amino acid substitution of a threonine for analanine at amino acid position 146. The assignment of amino acid codonand residue positions for human KRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01116: Variant p.Ala146Thr.

As used herein, “KRas A146V” refers to a mutant form of a mammalian KRasprotein that contains an amino acid substitution of a valine for analanine at amino acid position 146. The assignment of amino acid codonand residue positions for human KRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01116: Variant p.Ala146Val.

As used herein, “KRas A146P” refers to a mutant form of a mammalian KRasprotein that contains an amino acid substitution of a proline for analanine at amino acid position 146. The assignment of amino acid codonand residue positions for human KRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01116: Variant p.Ala146Pro.

As used herein, “HRas G12C” refers to a mutant form of a mammalian HRasprotein that contains an amino acid substitution of a cysteine for aglycine at amino acid position 12. The assignment of amino acid codonand residue positions for human HRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01112: Variant p.Gly12Cys.

As used herein, “HRas G12D” refers to a mutant form of a mammalian HRasprotein that contains an amino acid substitution of an aspartic acid fora glycine at amino acid position 12. The assignment of amino acid codonand residue positions for human HRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01112: Variant p.Gly12Asp.

As used herein, “HRas G12S” refers to a mutant form of a mammalian HRasprotein that contains an amino acid substitution of a serine for aglycine at amino acid position 12. The assignment of amino acid codonand residue positions for human HRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01112: Variant p.Gly12Ser.

As used herein, “HRas G12A” refers to a mutant form of a mammalian HRasprotein that contains an amino acid substitution of an alanine for aglycine at amino acid position 12. The assignment of amino acid codonand residue positions for human KRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01112: Variant p.Gly12Ala.

As used herein, “HRas G13D” refers to a mutant form of a mammalian HRasprotein that contains an amino acid substitution of an aspartic acid fora glycine at amino acid position 13. The assignment of amino acid codonand residue positions for human HRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01112: Variant p.Gly13Asp.

As used herein, “HRas G13C” refers to a mutant form of a mammalian HRasprotein that contains an amino acid substitution of a cysteine for aglycine at amino acid position 13. The assignment of amino acid codonand residue positions for human HRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01112: Variant p.Gly13Cys.

As used herein, “HRas Q61L” refers to a mutant form of a mammalian HRasprotein that contains an amino acid substitution of a leucine for aglutamine at amino acid position 41. The assignment of amino acid codonand residue positions for human HRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01112: Variant p.Gln61Leu.

As used herein, “HRas A146T” refers to a mutant form of a mammalian HRasprotein that contains an amino acid substitution of a threonine for analanine at amino acid position 146. The assignment of amino acid codonand residue positions for human NRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01112: Variant p.Ala146Thr.

As used herein, “HRas A146V” refers to a mutant form of a mammalian HRasprotein that contains an amino acid substitution of a valine for analanine at amino acid position 146. The assignment of amino acid codonand residue positions for human NRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01112: Variant p.Ala146Val.

As used herein, “HRas A146P” refers to a mutant form of a mammalian HRasprotein that contains an amino acid substitution of a proline for analanine at amino acid position 146. The assignment of amino acid codonand residue positions for human NRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01112: Variant p.Ala146Pro.

As used herein, “NRas G12C” refers to a mutant form of a mammalian NRasprotein that contains an amino acid substitution of a cysteine for aglycine at amino acid position 12. The assignment of amino acid codonand residue positions for human NRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01111: Variant p.Gly12Cys.

As used herein, “NRas G12D” refers to a mutant form of a mammalian NRasprotein that contains an amino acid substitution of an aspartic acid fora glycine at amino acid position 12. The assignment of amino acid codonand residue positions for human NRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01111: Variant p.Gly12Asp.

As used herein, “NRas G12S” refers to a mutant form of a mammalian NRasprotein that contains an amino acid substitution of a serine for aglycine at amino acid position 12. The assignment of amino acid codonand residue positions for human NRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01111: Variant p.Gly12Ser.

As used herein, “NRas G12A” refers to a mutant form of a mammalian NRasprotein that contains an amino acid substitution of an alanine for aglycine at amino acid position 12. The assignment of amino acid codonand residue positions for human KRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01111: Variant p.Gly12Ala.

As used herein, “NRas G13D” refers to a mutant form of a mammalian NRasprotein that contains an amino acid substitution of an aspartic acid fora glycine at amino acid position 13. The assignment of amino acid codonand residue positions for human NRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01111: Variant p.Gly13 Asp.

As used herein, “HNRas G13C” refers to a mutant form of a mammalian NRasprotein that contains an amino acid substitution of a cysteine for aglycine at amino acid position 13. The assignment of amino acid codonand residue positions for human NRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01111: Variant p.Gly13Cys.

As used herein, “HRas Q61L” refers to a mutant form of a mammalian HRasprotein that contains an amino acid substitution of a leucine for aglutamine at amino acid position 41. The assignment of amino acid codonand residue positions for human HRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01112: Variant p.Gln61Leu.

As used herein, “NRas A146T” refers to a mutant form of a mammalian NRasprotein that contains an amino acid substitution of a threonine for analanine at amino acid position 146. The assignment of amino acid codonand residue positions for human NRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01111: Variant p.Ala146Thr.

As used herein, “NRas A146V” refers to a mutant form of a mammalian NRasprotein that contains an amino acid substitution of a valine for analanine at amino acid position 146. The assignment of amino acid codonand residue positions for human NRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01111: Variant p.Ala146Val.

As used herein, “NRas A146P” refers to a mutant form of a mammalian NRasprotein that contains an amino acid substitution of a proline for analanine at amino acid position 146. The assignment of amino acid codonand residue positions for human NRas is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot P01111: Variant p.Ala146Pro.

As used herein, “a Ras family member” or “Ras family” refers to KRas,HRas, NRas, and activating mutants thereof, including at positions G12,G13, Q61 and A146.

A “Ras family-associated disease or disorder” as used herein refers todiseases or disorders associated with or mediated by or having anactivating Ras mutation, such as one at position G12, G13, Q61 or A146.Non-limiting examples of Ras family-associated disease or disorder are aKRas, HRas or NRas G12C-associated cancer, a KRas, HRas or NRasG12D-associated cancer, a KRas, HRas or NRas G12S-associated cancer, aKRas, HRas or NRas G12A-associated cancer, a KRas, HRas or NRasG13D-associated cancer, a KRas, HRas or NRas G13C-associated cancer, aKRas, HRas or NRas Q61X-associated cancer, a KRas, HRas or NRasA146T-associated cancer, a KRas, HRas or NRas A146V-associated cancer ora KRas, HRas or NRas A146P-associated cancer.

As used herein, “SOS1” refers to a mammalian Son of sevenless homolog 1(SOS1) enzyme.

A “SOS1-associated disease or disorder” as used herein refers todiseases or disorders associated with or mediated by or having anactivating SOS1 mutation. Examples of activating SOS1 mutations includeSOS1 N233S and SOS1 N233Y mutations.

As used herein, “SOS1 N233S” refers to a mutant form of a mammalian SOS1protein that contains an amino acid substitution of a serine for aglutamine at amino acid position 233. The assignment of amino acid codonand residue positions for human SOS1 is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot Q07889: Variant p.Gln233Ser.

As used herein, “SOS1 N233Y” refers to a mutant form of a mammalian SOS1protein that contains an amino acid substitution of a tyrosine for aglutamine at amino acid position 233. The assignment of amino acid codonand residue positions for human SOS1 is based on the amino acid sequenceidentified by UniProtKB/Swiss-Prot Q07889: Variant p.Gln233Tyr.

As used herein, an “SOS1 inhibitor” refers to compounds of the presentinvention that are represented by Formula (I) as described herein. Thesecompounds are capable of negatively inhibiting all or a portion of theinteraction of SOS1 with Ras family mutant or SOS1 activating mutationthereby reducing and/or modulating the nucleotide exchange activity ofRas family member—SOS1 complex.

As used herein, a “NF-1/NF-2-associated disease or disorder” refers todiseases or disorders associated with or mediated by or having aloss-of-function mutation in the neurofibromin (NF-1) gene orneurofibromin 2 (NF-2) gene.

As used herein, a “loss-of-function mutation” refers to any pointmutation(s), splice site mutation(s), fusions, nonsense mutations (anamino acid is mutated to a stop codon), in-frame or frame-shiftingmutations, including insertions and deletions, and a homozygous deletionof the genes encoding the protein in a target cell or cancer cell thatresults in a partial or complete loss of the presence, activity and/orfunction of the encoded protein.

The term “amino” refers to —NH₂.

The term “acetyl” refers to “—C(O)CH₃.

As herein employed, the term “acyl” refers to an alkylcarbonyl orarylcarbonyl substituent wherein the alkyl and aryl portions are asdefined herein.

The term “alkyl” as employed herein refers to straight and branchedchain aliphatic groups having from 1 to 12 carbon atoms. As such,“alkyl” encompasses C₁, C₂, C₃, C₄, C₅, C₆, C₇, C₈, C₉, C₁₀, C₁₁ and C₁₂groups. Examples of alkyl groups include, without limitation, methyl,ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl,pentyl, and hexyl.

The term “alkenyl” as used herein means an unsaturated straight orbranched chain aliphatic group with one or more carbon-carbon doublebonds, having from 2 to 12 carbon atoms. As such, “alkenyl” encompassesC₂, C₃, C₄, C₅, C₆, C₇, C₈, C₉, C₁₀, C₁₁ and C₁₂ groups. Examples ofalkenyl groups include, without limitation, ethenyl, propenyl, butenyl,pentenyl, and hexenyl.

The term “alkynyl” as used herein means an unsaturated straight orbranched chain aliphatic group with one or more carbon-carbon triplebonds, having from 2 to 12 carbon atoms. As such, “alkynyl” encompassesC₂, C₃, C₄, C₅, C₆, C₇, C₈, C₉, C₁₀, C₁₁ and C₁₂ groups. Examples ofalkynyl groups include, without limitation, ethynyl, propynyl, butynyl,pentynyl, and hexynyl.

An “alkylene,” “alkenylene,” or “alkynylene” group is an alkyl, alkenyl,or alkynyl group, as defined hereinabove, that is positioned between andserves to connect two other chemical groups. Examples of alkylene groupsinclude, without limitation, methylene, ethylene, propylene, andbutylene. Exemplary alkenylene groups include, without limitation,ethenylene, propenylene, and butenylene. Exemplary alkynylene groupsinclude, without limitation, ethynylene, propynylene, and butynylene.

The term “alkoxy” refers to —OC1-C6 alkyl.

The term “cycloalkyl” as employed herein is a saturated and partiallyunsaturated cyclic hydrocarbon group having 3 to 12 carbons. As such,“cycloalkyl” includes C₃, C₄, C₅, C₆, C₇, C₈, C₉, C₁₀, C₁₁ and C₁₂cyclic hydrocarbon groups. Examples of cycloalkyl groups include,without limitation, cyclopropyl, cyclobutyl, cyclopentyl, cyclopentenyl,cyclohexyl, cyclohexenyl, cycloheptyl, and cyclooctyl.

The term “heteroalkyl” refers to an alkyl group, as defined hereinabove,wherein one or more carbon atoms in the chain are independently replacedO, S, or NR^(x), wherein R^(x) is hydrogen or C1-C3 alkyl. Examples ofheteroalkyl groups include methoxymethyl, m ethoxy ethyl andmethoxypropyl.

An “aryl” group is a C₆-C₁₄ aromatic moiety comprising one to threearomatic rings. As such, “aryl” includes C₆, C₁₀, C₁₃, and C₁₄ cyclichydrocarbon groups. An exemplary aryl group is a C₆-C₁₀ aryl group.Particular aryl groups include, without limitation, phenyl, naphthyl,anthracenyl, and fluorenyl. An “aryl” group also includes fusedmulticyclic (e.g, bicyclic) ring systems in which one or more of thefused rings is non-aromatic, provided that at least one ring isaromatic, such as indenyl.

An “aralkyl” or “arylalkyl” group comprises an aryl group covalentlylinked to an alkyl group wherein the moiety is linked to another groupvia the alkyl moiety. An exemplary aralkyl group is—(C1-C6)alkyl(C6-C10)aryl, including, without limitation, benzyl,phenethyl, and naphthylmethyl.

A “heterocyclyl” or “heterocyclic” group is a mono- or bicyclic (fused,spiro or bridged) ring structure having from 3 to 12 atoms (3, 4, 5, 6,7, 8, 9, 10, 11 or 12 atoms), or having from 3 to 12 atoms (3, 4, 5, 6,7, 8, 9, 10, 11, 12 or 13 atoms), for example 4 to 8 atoms, wherein oneor more ring atoms are independently —C(O)—, N, NR⁴, O, S or S(O)₂, andthe remainder of the ring atoms are quaternary or carbonyl carbons.Examples of heterocyclic groups include, without limitation, epoxy,oxiranyl, oxetanyl, azetidinyl, aziridinyl, tetrahydrofuranyl,tetrahydropyranyl, tetrahydrothiophenyl, pyrrolidinyl, piperidinyl,piperazinyl, imidazolidinyl, thiazolidinyl, thiatanyl, dithianyl,trithianyl, azathianyl, oxathianyl, dioxolanyl, oxazolidinyl,oxazolidinonyl, decahydroquinolinyl, piperidonyl, 4-piperidonyl,thiomorpholinyl, dimethyl-morpholinyl, and morpholinyl.

As used herein, “heterocyclyl” refers to a heterocyclyl group covalentlylinked to another group via a bond.

As used herein, the term “heteroaryl” refers to a group having 5 to 14ring atoms, preferably 5, 6, 10, 13 or 14 ring atoms; having 6, 10, or14 n electrons shared in a cyclic array, which may include 1, 2 or 3rings, and having, in addition to carbon atoms, from one to threeheteroatoms that are each independently N, O, or S. “Heteroaryl” alsoincludes fused multi cyclic (e.g., bicyclic, tricyclic) ring systems inwhich one or more of the fused rings is non-aromatic (regardless ofwhich ring is attached), provided that at least one ring is aromatic andat least one ring contains an N, O, or S ring atom.

Examples of heteroaryl groups include acridinyl, azocinyl,benzimidazolyl, benzofuranyl, benzo[d]oxazol-2(3H)-one,2H-benzo[b][1,4]oxazin-3(4H)-one, benzothiofuranyl, benzothiophenyl,benzoxazolyl, benzthiazolyl, benztriazolyl, benztetrazolyl,benzisoxazolyl, benzisothiazolyl, benzimidazolinyl, carbazolyl,4aH-carbazolyl, carbolinyl, chromanyl, chromenyl, cinnolinyl, furanyl,furazanyl, imidazolinyl, imidazolyl, 1H-indazolyl, indolenyl, indolinyl,indolizinyl, indolyl, 3H-indolyl, isobenzofuranyl, isochromanyl,isoindazolyl, isoindolinyl, isoindolyl, isoquinolinyl, isothiazolyl,isoxazolyl, naphthyridinyl, octahydroisoquinolinyl, oxadiazolyl,1,2,3-oxadiazolyl, 1,2,4-oxadiazolyl, 1,2,5-oxadiazolyl,1,3,4-oxadiazolyl, oxazolidinyl, oxazolyl, oxazolidinyl, pyrimidinyl,phenanthridinyl, phenanthrolinyl, phenazinyl, phenothiazinyl,phenoxathiinyl, phenoxazinyl, phthalazinyl, piperonyl, pteridinyl,purinyl, pyranyl, pyrazinyl, pyrazolidinyl, pyrazolinyl, pyrazolyl,pyridazinyl, pyridooxazole, pyridoimidazole, pyridothiazole, pyridinyl,pyridyl, pyrimidinyl, pyrrolinyl, 2H-pyrrolyl, pyrrolyl, quinazolinyl,quinolinyl, 4H-quinolizinyl, quinoxalinyl, quinuclidinyl,tetrahydroisoquinolinyl, tetrahydroquinolinyl, tetrazolyl,6H-1,2,5-thiadiazinyl, 1,2,3-thiadiazolyl, 1,2,4-thiadiazolyl,1,2,5-thiadiazolyl, 1,3,4-thiadiazolyl, thianthrenyl, thiazolyl,thienyl, thienothiazolyl, thienooxazolyl, thienoimidazolyl, thiophenyl,triazinyl, 1,2,3-triazolyl, 1,2,4-triazolyl, 1,2,5-triazolyl,1,3,4-triazolyl, and xanthenyl.

A “heteroaralkyl” or “heteroarylalkyl” group comprises a heteroarylgroup covalently linked to another group via a bond. Examples ofheteroalkyl groups comprise a C₁-C₆ alkyl group and a heteroaryl grouphaving 5, 6, 9, or 10 ring atoms. Examples of heteroaralkyl groupsinclude pyridylmethyl, pyridylethyl, pyrrolylmethyl, pyrrolylethyl,imidazolylmethyl, imidazolylethyl, thiazolylmethyl, thiazolylethyl,benzimidazolylmethyl, benzimidazolylethyl quinazolinylmethyl,quinolinylmethyl, quinolinylethyl, benzofuranylmethyl, indolinylethylisoquinolinylmethyl, isoinodylmethyl, cinnolinylmethyl, andbenzothiophenylethyl. Specifically excluded from the scope of this termare compounds having adjacent ring O and/or S atoms.

An “arylene,” “heteroarylene,” or “heterocyclylene” group is an bivalentaryl, heteroaryl, or heterocyclyl group, respectively, as definedhereinabove, that is positioned between and serves to connect two otherchemical groups.

As employed herein, when a moiety (e.g., cycloalkyl, aryl, heteroaryl,heterocyclyl, urea, etc.) is described as “optionally substituted”without expressly stating the substituents it is meant that the groupoptionally has from one to four, preferably from one to three, morepreferably one or two, non-hydrogen substituents.

The term “halogen” or “halo” as employed herein refers to chlorine,bromine, fluorine, or iodine.

The term “haloalkyl” refers to an alkyl chain in which one or morehydrogens have been replaced by a halogen. Exemplary haloalkyls aretrifluoromethyl, difluoromethyl, flurochloromethyl, chloromethyl, andfluoromethyl.

The term “hydroxyalkyl” refers to -alkylene-OH.

As used herein, the term “subject,” “individual,” or “patient,” usedinterchangeably, refers to any animal, including mammals such as mice,rats, other rodents, rabbits, dogs, cats, swine, cattle, sheep, horses,primates, and humans. In some embodiments, the patient is a human. Insome embodiments, the subject has experienced and/or exhibited at leastone symptom of the disease or disorder to be treated and/or prevented.In some embodiments, the subject has been identified or diagnosed ashaving a cancer having a KRas G12 or G13 mutation (e.g., as determinedusing a regulatory agency-approved, e.g., FDA-approved, assay or kit).In some embodiments, the subject has a tumor that is positive for a KRasG12C mutation, a KRas G12D mutation, a KRas G12S mutation, a KRas G12Amutaation, a KRas G13D mutation or a KRas G13C mutation (e.g., asdetermined using a regulatory agency-approved assay or kit). The subjectcan be a subject with a tumor(s) that is positive for a a KRas G12Cmutation, a KRas G12D mutation, a KRas G12S mutation, a KRas G12Amutaation, a KRas G13D mutation or a KRas G13C mutation (e.g.,identified as positive using a regulatory agency-approved, e.g.,FDA-approved, assay or kit). The subject can be a subject whose tumorshave a KRas G12C mutation, a KRas G12D mutation, a KRas G12S mutation, aKRas G12A mutaation, a KRas G13D mutation or a KRas G13C mutation (e.g.,where the tumor is identified as such using a regulatoryagency-approved, e.g., FDA-approved, kit or assay). In some embodiments,the subject is suspected of having a KRas G12 or G13 gene-associatedcancer. In some embodiments, the subject has a clinical recordindicating that the subject has a tumor that has a KRas G12C mutation(and optionally the clinical record indicates that the subject should betreated with any of the compositions provided herein).

The term “pediatric patient” as used herein refers to a patient underthe age of 16 years at the time of diagnosis or treatment. The term“pediatric” can be further be divided into various subpopulationsincluding: neonates (from birth through the first month of life);infants (1 month up to two years of age); children (two years of age upto 12 years of age); and adolescents (12 years of age through 21 yearsof age (up to, but not including, the twenty-second birthday)). BerhmanR E, Kliegman R, Arvin A M, Nelson W E. Nelson Textbook of Pediatrics,15th Ed. Philadelphia: W.B. Saunders Company, 1996; Rudolph A M, et al.Rudolph's Pediatrics, 21st Ed. New York: McGraw-Hill, 2002; and Avery MD, First L R. Pediatric Medicine, 2nd Ed. Baltimore: Williams & Wilkins;1994.

As used herein, “an effective amount” of a compound is an amount that issufficient to negatively modulate or inhibit the activity of SOS1enzyme.

As used herein, a “therapeutically effective amount” of a compound is anamount that is sufficient to ameliorate or in some manner reduce asymptom or stop or reverse progression of a condition, or negativelymodulate or inhibit the activity of SOS1. Such amount may beadministered as a single dosage or may be administered according to aregimen, whereby it is effective.

As used herein, “treatment” means any manner in which the symptoms orpathology of a condition, disorder or disease in a patient areameliorated or otherwise beneficially altered.

As used herein, “amelioration of the symptoms of a particular disorderby administration of a particular compound or pharmaceuticalcomposition” refers to any lessening, whether permanent or temporary,lasting or transient, that can be attributed to or associated withadministration of the composition.

Compounds

In one aspect of the invention, compounds are provided represented byFormula (I):

or a pharmaceutically acceptable salt thereof,

wherein:

R¹ is hydrogen, hydroxyl, C1-C6 alkyl, alkoxy, —N(R⁶)₂, —NR⁶C(O)R⁶,—C(O)N(R⁶)₂, —SO₂alkyl, —SO₂NR⁶alkyl, cycloalkyl, -Q-heterocyclyl, aryl,or heteroaryl, wherein the cycloalkyl, the heterocyclyl, the aryl, andthe heteroaryl are each optionally substituted with one or more R² orL-R²;

each Q is independently a bond, O or NR⁶;

X is N or CR⁷;

each R² is independently C1-C3 alkyl, oxo (i.e., (C═O), hydroxy,halogen, cyano, hydroxyalkyl, haloalkyl, alkoxy, —C(O)N(R⁶)₂, —N(R⁶)₂,—SO₂alkyl, —NR⁶C(O)C1-C3 alkyl, —C(O)cycloalkyl, —C(O)C1-C3 alkyl,—C(O)heterocyclyl, aryl, heteroaryl or heterocyclyl, wherein thecycloalkyl, the heterocyclyl, the aryl, the heteroaryl or theheterocyclyl are each optionally substituted with one or more R¹¹;

R³ is hydrogen, C1-C6 alkyl, alkoxy, —N(R¹⁰)₂, -L-N(R¹⁰)₂, cycloalkyl,haloalkyl or heterocyclyl, wherein the C1-C6 alkyl, the cycloalkyl andthe heterocyclyl are each optionally substituted with one or more R⁹;

Y is a bond or heteroarylene;

R⁴ is aryl or heteroaryl, each optionally substituted with one or moreR⁵;

each R⁵ is independently hydroxy, halogen, cyano, hydroxyalkyl, alkoxy,C1-C3 alkyl, haloalkyl, haloalkyl-OH, —N(R⁶)₂, -L-N(R⁶)₂ or —SO₂alkyl;

L is C1-C3 alkylene;

each R⁶ is independently hydrogen, C1-C3 alkyl, haloalkyl, orcycloalkyl;

R⁷ is hydrogen, cyano, or alkoxy;

R⁸ is C1-C2 alkyl or haloC1-C2 alkyl;

each R⁹ is independently hydroxy, halogen, amino, cyano, alkoxy, orC1-C3 alkyl;

each R¹⁰ is independently hydrogen, C1-C3 alkyl or cycloalkyl;

each R¹¹ is independently C1-C3 alkyl, halogen or haloalkyl; and

R¹² is hydrogen, halogen or C1-C3 alkyl.

In one embodiment for compounds of Formula (I), X is N. In certainembodiments wherein X is N, R¹ is alkoxy. In one embodiment, the alkoxyis methoxy.

In one embodiment for compounds of Formula (I), X is N. In certainembodiments wherein X is N, R¹ is -Q-heterocyclyl optionally substitutedwith one or more R². In certain embodiments, R¹ is -Q-heterocyclyl, andwherein Q is a bond and the heterocyclyl is morpholinyl, piperazinyl, orpiperazinone optionally substituted with one or more R². In certainembodiments, the heterocyclyl is morpholinyl or piperazinyl, Y is abond, and R⁴ is aryl optionally substituted with one or more R⁵. In oneembodiment, the heterocyclyl is morpholinyl, piperazinyl, orpiperazinone, Y is heteroarylene, and R⁴ is aryl optionally substitutedwith one or more R⁵.

In certain embodiments of the invention, R¹ is -Q-heterocyclyl, andwherein the heterocyclyl is bridged morpholinyl, bridged piperazinyl, orbridged piperazinone.

In certain embodiments of the invention, R¹ is -Q-heterocyclyl, andwherein the heterocyclyl is spirocyclic ring system containing two ormore rings. In certain of these embodiments, the spirocyclic ring systemcomprises two rings each containing a heteroatom. In certain other ofthese embodiments, the spirocyclic ring system contains a ring with noheteroatom (i.e., one ring rith a heteroatom, and one ring without aheteroatom).

In certain embodiments of the invention, R¹ is heteroaryl, wherein theheterocyclyl is optionally substituted with one or more R² or L-R². Incertain of these embodiments, the heteroaryl is a bicyclic or tricyclicring system comprising, in additional to one or more aromatic ring, anon-aromatic ring, for example a bicyclic or tricyclic ring system suchas 5,6,7,8-tetrahydro-[1,2,4]triazolopyrazinyl,5,6,7,8-tetrahydroimidazopyrazinyl, 2,4,5,6-tetrahydropyrrolopyrazolyl,1,2,3,4-tetrahydrobenzo[4,5]imidazopyrazinyl or 4,5,6,7-tetrahydropyrazolopyrazinyl.

In one embodiment for compounds of Formula (I), X is CR⁷. In oneembodiment when X is CR⁷, R⁷ is cyano.

In one embodiment for compounds of Formula (I), X is CR⁷. In oneembodiment when X is CR⁷, R⁷ is hydrogen.

In one embodiment for compounds of Formula (I), X is CR⁷, R⁷ ishydrogen, R¹ is hydrogen. In another embodiment, R¹ is hydroxyl. Incertain embodiments, R¹ is —N(R⁶)₂. In one embodiment, wherein R¹ is—N(R⁶)₂ and each R⁶ is C1-C3 alkyl. In one embodiment, each C1-C3 alkylgroup is methyl. In other embodiments R¹ is —NR⁶C(O)R⁶. In oneembodiment, each C1-C3 alkyl is methyl. In one embodiment, the R⁶ of theNR⁶ is hydrogen and R⁶ of the C(O)R⁶ is C1-C3 alkyl.

In another embodiment when X is CR⁷ and R⁷ is hydrogen, R¹ is—C(O)N(R⁶)₂. In one embodiment, each C1-C3 alkyl is methyl. In oneembodiment, each C1-C3 alkyl is hydrogen. In certain embodiments, R¹ is—SO₂alkyl or —SO₂NR⁶alkyl. In one embodiment, R1 is —SO₂NR⁶alkyl and R⁶is hydrogen. In other embodiments, R¹ is cycloalkyl optionallysubstituted with one or more R². In one embodiment, the cycloalkyl iscyclobutyl, cyclopentyl or cyclohexyl, each optionally substituted withone or more R². In one embodiment, the cyclobutyl, cyclopentyl or thecyclohexyl are substituted with one R², wherein R² is C1-C3 alkyl,alkoxy, hydroxyl or —N(R⁶)₂. In one embodiment, R² is —N(R⁶)₂ and eachR⁶ is C1-C3 alkyl. In one embodiment, each C1-C3 alkyl is methyl.

In another embodiment when X is CR⁷ and R⁷ is hydrogen, R¹ is-Q-heterocyclyl optionally substituted with one or more R². In oneembodiment, Q is a bond and the heterocyclyl is morpholinyl, piperdinyl,piperazinyl, N-methyl piperazinyl, piperazinone,1-methyl-piperazin-2-one, diazepanyl, 6,6-difluoro-1,4-diazepan-1-yl or4-methylthiomorpholine 1,1-dioxide. In another embodiment, Q is a bondand the heterocyclyl is pyrrolidinyl or tetrahydropyranyl, eachoptionally substituted with one or more R². In one embodiment, thepyrrolidinyl or the tetrahydropyranyl are substituted with one R²,wherein R² is C1-C3 alkyl, alkoxy, hydroxyl or —N(R⁶)₂.

In another embodiment when X is CR⁷ and R⁷ is hydrogen, R¹ is-Q-heterocyclyl, Q is a bond and the heterocyclyl is piperazinylsubstituted with one R², wherein R² is heteroaryl optionally substitutedwith one or more R¹¹. In one embodiment, the heteroaryl is pyrazolylsubstituted with two R¹¹, wherein each R¹¹ is C1-C3 alkyl.

In another embodiment when X is CR⁷ and R⁷ is hydrogen, R¹ is-Q-heterocyclyl, Q is a bond and the heterocyclyl is piperazinylsubstituted with one R², wherein R² is —C(O)cycloalkyl or—C(O)heterocyclyl, wherein the cycloalkyl or heterocyclyl portion of the—C(O)cycloalkyl or —C(O)heterocyclyl are each optionally substitutedwith one or more R¹¹. In one embodiment, R² is —C(O)cycloalkyl and thecycloalkyl is cyclopropyl substituted with one R¹¹, wherein R¹¹ is C1-C3alkyl or haloalkyl. In one embodiment, R² is —C(O)heterocyclyl, whereinthe heterocyclyl is oxetanyl, tetrahydrofuranyl or tetrahydropyranyl.

In one embodiment, Q is a bond and the heterocyclyl is a bicyclicheterocyclyl. In certain embodiments, the bicyclic heterocyclyl isdiazabicyclo[3.2.0]heptan-2-yl,(1R,5R)-2,6-diazabicyclo[3.2.0]heptan-2-yl,diazabicyclo[3.2.0]heptan-6-yl,(1R,5R)-2,6-diazabicyclo[3.2.0]heptan-6-yl,6,7-dihydropyrazolo[1,5-a]pyrazin-5(4H)-yl,5,6-dihydroimidazo[1,5-a]pyrazin-7(8H)-yl,1,3-dimethyl-5,6-dihydroimidazo[1,5-a]pyrazin-7(8H)-yl or(R)-2-methylhexahydropyrrolo[1,2-a]pyrazin-6(2H)-one.

In yet another embodiment, Q is O and the heterocyclyl is azetidinyl,tetrahydrofuranyl, pyrrolidinyl, or piperdinyl.

In another embodiment when X is CR⁷ and R⁷ is hydrogen, R¹ is aryloptionally substituted with one or more R². In one embodiment, the arylis phenyl optionally substituted with one or more R². In certainembodiments, the phenyl is substituted with one R², wherein R² is C1-C3alkyl, alkoxy, hydroxyl or —N(R⁶)₂. In one embodiment, R² is —N(R⁶)₂ andeach R⁶ is C1-C3 alkyl. In one embodiment, each C1-C3 alkyl is methyl.In other embodiments, R¹ is heteroaryl optionally substituted with oneor more R². In one embodiment, the heteroaryl is pyrazolyl optionallysubstituted with one or more R². In one embodiment, the pyrazolyl issubstituted with one R², wherein R² is C1-C3 alkyl, alkoxy, hydroxyl or—N(R⁶)₂. In one embodiment, R² is —N(R⁶)₂ and each R⁶ is C1-C3 alkyl. Inone embodiment, each C1-C3 alkyl is methyl.

In one embodiment for compounds of Formula (I), X is CR⁷ and R⁷ isalkoxy. In one embodiment, the alkoxy is methoxy. In certain embodimentswherein X is CR⁷ and R⁷ is alkoxy, R¹ is alkoxy. In one embodiment, theR⁷ alkoxy is methoxy and the R¹ alkoxy is methoxy.

In certain embodiments for compounds of Formula (I) wherein X is N orCR⁷, Y is heteroarylene. In one embodiment, the heteroarylene isthiophenylene.

In certain embodiments for compounds of Formula (I) wherein X is N orCR⁷, Y is a bond.

In certain embodiments for compounds of Formula (I), R⁴ is aryl orheteroaryl, each optionally substituted with one or more R⁵. In oneembodiment, R⁴ is aryl optionally substituted with one or more R⁵. Inone embodiment, the aryl is phenyl optionally substituted with one ormore R⁵. In certain embodiments, the phenyl is substituted with one R⁵,wherein R⁵ is C1-C4 alkyl, haloalkyl or -L-N(R⁶)₂.

In one embodiment, R⁵ is -L-N(R⁶)₂, wherein L is methylene and one R⁶ ishydrogen and the second R⁶ is C1-C3 alkyl. In one embodiment, the C1-C3alkyl is methyl. In another embodiment, R⁵ is -L-N(R⁶)₂, wherein L ismethylene and each R⁶ is C1-C3 alkyl. In one embodiment, each of theC1-C3 alkyl is methyl.

In certain embodiments wherein R⁴ is aryl, R⁴ is phenyl substituted withtwo R⁵, wherein one R⁵ is C1-C4 alkyl and the second R⁵ is haloalkyl. Inone embodiment, the C1-C4 alkyl is methyl and the haloalkyl istrifluoromethyl. In certain embodiments, R⁴ is phenyl substituted withtwo R⁵, wherein one R⁵ is C1-C4 alkyl and the second R⁵ is -L-N(R⁶)₂. Inone embodiment, L is methylene and each R⁶ is C1-C3 alkyl.

In one embodiment for compounds of Formula (I), R³ is hydrogen.

In certain embodiments for compounds of Formula (I), R³ is C1-C6 alkyloptionally substituted with one or more R⁹. In one embodiment, the C1-C6alkyl is methyl, ethyl or isopropyl.

In certain embodiments for compounds of Formula (I), R³ is alkoxy. Inone embodiment, the alkoxy is methoxy.

In certain embodiments for compounds of Formula (I), R³ is haloalkyl. Inone embodiment, the haloalkyl is trifluoromethyl.

In certain embodiments for compounds of Formula (I), R³ is cycloalkyloptionally substituted with one or more R⁹. In one embodiment, thecycloalkyl is cyclopropyl. In one embodiment, the cycloalkyl issubstituted with one R⁹, wherein the one R⁹ is halogen amino, hydroxylor alkoxy.

In certain embodiments for compounds of Formula (I), R³ is —N(R¹⁰)₂. Inone embodiment, each R¹⁰ is C1-C3 alkyl. In certain embodiments, eachC1-C3 alkyl is methyl.

In certain embodiments for compounds of Formula (I), R³ is -L-N(R¹⁰)₂.In one embodiment, each R¹⁰ is C1-C3 alkyl. In certain embodiments, eachC1-C3 alkyl is methyl.

In certain embodiments for compounds of Formula (I), R³ is heterocyclyl,aryl, or heteroaryl, wherein the heterocyclyl, the aryl, and theheteroaryl are each optionally substituted with one or more R⁹.

In certain embodiments for compounds of Formula (I), R⁸ is C1-C2 alkyl.In one embodiment, the C1-C2 alkyl is methyl.

In certain embodiments for compounds of Formula (I), R⁸ is haloC1-C2alkyl. In one embodiment, the haloC1-C2 alkyl is fluoromethyl,difluoromethyl or trifluoromethyl.

In one embodiment, the compound of Formula (I) is:

and pharmaceutically acceptable salts of the foregoing compounds.

The compounds of Formula (I) may be formulated into pharmaceuticalcompositions.

Pharmaceutical Compositions

In another aspect, the invention provides pharmaceutical compositionscomprising a SOS1 inhibitor according to the invention and apharmaceutically acceptable carrier, excipient, or diluent. Compounds ofthe invention may be formulated by any method well known in the art andmay be prepared for administration by any route, including, withoutlimitation, parenteral, oral, sublingual, transdermal, topical,intranasal, intratracheal, or intrarectal. In certain embodiments,compounds of the invention are administered intravenously in a hospitalsetting. In certain other embodiments, administration may preferably beby the oral route.

The characteristics of the carrier will depend on the route ofadministration. As used herein, the term “pharmaceutically acceptable”means a non-toxic material that is compatible with a biological systemsuch as a cell, cell culture, tissue, or organism, and that does notinterfere with the effectiveness of the biological activity of theactive ingredient(s). Thus, compositions according to the invention maycontain, in addition to the inhibitor, diluents, fillers, salts,buffers, stabilizers, solubilizers, and other materials well known inthe art. The preparation of pharmaceutically acceptable formulations isdescribed in, e.g., Remington's Pharmaceutical Sciences, 18th Edition,ed. A. Gennaro, Mack Publishing Co., Easton, Pa., 1990.

As used herein, the term “pharmaceutically acceptable salts” refers tosalts that retain the desired biological activity of theabove-identified compounds and exhibit minimal or no undesiredtoxicological effects. Examples of such salts include, but are notlimited to acid addition salts formed with inorganic acids (for example,hydrochloric acid, hydrobromic acid, sulfuric acid, phosphoric acid,nitric acid, and the like), and salts formed with organic acids such asacetic acid, oxalic acid, tartaric acid, succinic acid, malic acid,ascorbic acid, benzoic acid, tannic acid, pamoic acid, alginic acid,polyglutamic acid, naphthalenesulfonic acid, naphthalenedisulfonic acid,and polygalacturonic acid. The compounds can also be administered aspharmaceutically acceptable quaternary salts known by those skilled inthe art, which specifically include the quaternary ammonium salt of theformula —NR+Z—, wherein R is hydrogen, alkyl, or benzyl, and Z is acounterion, including chloride, bromide, iodide, —O-alkyl,toluenesulfonate, methylsulfonate, sulfonate, phosphate, or carboxylate(such as benzoate, succinate, acetate, glycolate, maleate, malate,citrate, tartrate, ascorbate, benzoate, cinnamoate, mandeloate,benzyloate, and diphenylacetate).

The active compound is included in the pharmaceutically acceptablecarrier or diluent in an amount sufficient to deliver to a patient atherapeutically effective amount without causing serious toxic effectsin the patient treated. A dose of the active compound for all of theabove-mentioned conditions is in the range from about 0.01 to 300 mg/kg,preferably 0.1 to 100 mg/kg per day, more generally 0.5 to about 25 mgper kilogram body weight of the recipient per day. A typical topicaldosage will range from 0.01-3% wt/wt in a suitable carrier. Theeffective dosage range of the pharmaceutically acceptable derivativescan be calculated based on the weight of the parent compound to bedelivered. If the derivative exhibits activity in itself, the effectivedosage can be estimated as above using the weight of the derivative, orby other means known to those skilled in the art.

The pharmaceutical compositions comprising compounds of the presentinvention may be used in the methods described herein.

Methods of Use

In yet another aspect, the invention provides for methods for inhibitingSOS1 activity in a cell, comprising contacting the cell in whichinhibition of SOS1 activity is desired in vitro with an effective amountof a compound of Formula (I), pharmaceutically acceptable salts thereofor pharmaceutical compositions containing the compound orpharmaceutically acceptable salt thereof.

The compositions and methods provided herein are particularly deemeduseful for inhibiting SOS1 activity in a cell. In one embodiment, a cellin which inhibition of SOS1 activity is desired is contacted in vivowith a therapeutically effective amount of a compound of Formula (I) tonegatively modulate the activity of SOS1. In other embodiments, atherapeutically effective amount of pharmaceutically acceptable salt orpharmaceutical compositions containing the compound of Formula (I) maybe used. In one embodiment, the cell harbors an activating mutation in aRas family member, such as KRas, HRas, or NRas. In one embodiment, thecell has aberrant SOS1 activity. In one embodiment, the aberrant SOS1activity is the result of a SOS1 activating mutation. In one embodiment,the SOS1 activating mutation is a N233S or N233Y mutation. In oneembodiment, the cell has aberrant NF-1 or NF-2 activity. In oneembodiment, the aberrant NF-1 or NF-2 activity is the result of a NF-1or NF-2 activating mutation.

By negatively modulating the activity of SOS1, the methods are designedto block the interaction between SOS1 and the Ras family member andincreased GTP-loading of RAS proteins thereby decreasing or inhibitingthe GTP nucleotide exchange and locking the Ras family member in theGDP-bound, inactive form resulting in the inhibition of downstreamRas-mediated signaling. The cells may be contacted in a single dose ormultiple doses in accordance with a particular treatment regimen toaffect the desired negative modulation of SOS1.

In another aspect, methods of treating cancer comprising administeringto a patient having cancer a therapeutically effective amount of acompound of Formula (I), pharmaceutically acceptable salts thereof orpharmaceutical compositions comprising the compound or pharmaceuticallyacceptable salts thereof are provided. In one embodiment, the cancer isa Ras family-associated cancer. In one embodiment, the cancer is aSOS-1-associated cancer. In one embodiment, the cancer is aNF-1/NF-2-associated cancer.

The compositions and methods provided herein may be used for thetreatment of a wide variety of cancer including tumors such as prostate,breast, brain, skin, cervical carcinomas, testicular carcinomas, etc.More particularly, cancers that may be treated by the compositions andmethods of the invention include, but are not limited to tumor typessuch as astrocytic, breast, cervical, colorectal, endometrial,esophageal, gastric, head and neck, hepatocellular, laryngeal, lung,oral, ovarian, prostate and thyroid carcinomas and sarcomas. Morespecifically, these compounds can be used to treat: Cardiac: sarcoma(angiosarcoma, fibrosarcoma, rhabdomyosarcoma, liposarcoma), myxoma,rhabdomyoma, fibroma, lipoma and teratoma; Lung: bronchogenic carcinoma(squamous cell, undifferentiated small cell, undifferentiated largecell, adenocarcinoma), alveolar (bronchiolar) carcinoma, bronchialadenoma, sarcoma, lymphoma, chondromatous hamartoma, mesothelioma;Gastrointestinal: esophagus (squamous cell carcinoma, adenocarcinoma,leiomyosarcoma, lymphoma), stomach (carcinoma, lymphoma,leiomyosarcoma), pancreas (ductal adenocarcinoma, insulinoma,glucagonoma, gastrinoma, carcinoid tumors, vipoma), small bowel(adenocarcinoma, lymphoma, carcinoid tumors, Kaposi's sarcoma,leiomyoma, hemangioma, lipoma, neurofibroma, fibroma), large bowel(adenocarcinoma, tubular adenoma, villous adenoma, hamartoma,leiomyoma); Genitourinary tract: kidney (adenocarcinoma, Wilm's tumor(nephroblastoma), lymphoma, leukemia), bladder and urethra (squamouscell carcinoma, transitional cell carcinoma, adenocarcinoma), prostate(adenocarcinoma, sarcoma), testis (seminoma, teratoma, embryonalcarcinoma, teratocarcinoma, choriocarcinoma, sarcoma, interstitial cellcarcinoma, fibroma, fibroadenoma, adenomatoid tumors, lipoma); Liver:hepatoma (hepatocellular carcinoma), cholangiocarcinoma, hepatoblastoma,angiosarcoma, hepatocellular adenoma, hemangioma; Biliary tract: gallbladder carcinoma, ampullary carcinoma, cholangiocarcinoma; Bone:osteogenic sarcoma (osteosarcoma), fibrosarcoma, malignant fibroushistiocytoma, chondrosarcoma, Ewing's sarcoma, malignant lymphoma(reticulum cell sarcoma), multiple myeloma, malignant giant cell tumorchordoma, osteochronfroma (osteocartilaginous exostoses), benignchondroma, chondroblastoma, chondromyxofibroma, osteoid osteoma andgiant cell tumors; Nervous system: skull (osteoma, hemangioma,granuloma, xanthoma, osteitis deformans), meninges (meningioma,meningiosarcoma, gliomatosis), brain (astrocytoma, medulloblastoma,glioma, ependymoma, germinoma (pinealoma), glioblastoma multiform,oligodendroglioma, schwannoma, retinoblastoma, congenital tumors),spinal cord neurofibroma, meningioma, glioma, sarcoma); Gynecological:uterus (endometrial carcinoma), cervix (cervical carcinoma, pre-tumorcervical dysplasia), ovaries (ovarian carcinoma (serouscystadenocarcinoma, mucinous cystadenocarcinoma, unclassifiedcarcinoma), granulosa-thecal cell tumors, Sertoli-Leydig cell tumors,dysgerminoma, malignant teratoma), vulva (squamous cell carcinoma,intraepithelial carcinoma, adenocarcinoma, fibrosarcoma, melanoma),vagina (clear cell carcinoma, squamous cell carcinoma, botryoid sarcoma(embryonal rhabdomyosarcoma), fallopian tubes (carcinoma); Hematologic:blood (myeloid leukemia (acute and chronic), acute lymphoblasticleukemia, chronic lymphocytic leukemia, myeloproliferative diseases,multiple myeloma, myelodysplastic syndrome), Hodgkin's disease,non-Hodgkin's lymphoma (malignant lymphoma); Skin: malignant melanoma,basal cell carcinoma, squamous cell carcinoma, Kaposi's sarcoma, molesdysplastic nevi, lipoma, angioma, dermatofibroma, keloids, psoriasis;and Adrenal glands: neuroblastoma. In certain embodiments, the cancer isdiffuse large B-cell lymphoma (DLBCL).

In one embodiment, the cancer is a Ras family-associated cancer, such asa KRas, NRas or HRas-associated cancer. In certain embodiments, the Rasfamily-associated cancer is non-small cell lung cancer or pancreaticcancer. In one embodiment, the cancer is a SOS1-associated cancer. Incertain embodiments, the SOS1-associated cancer is lung adenocarcinoma,embryonal rhabdomyosarcoma, Sertoli cell testis tumor and granular celltumors of the skin. In one embodiment, the cancer is a NF-1-associatedcancer.

The concentration and route of administration to the patient will varydepending on the cancer to be treated. The compounds, pharmaceuticallyacceptable salts thereof and pharmaceutical compositions comprising suchcompounds and salts also may be co-administered with otheranti-neoplastic compounds, e.g., chemotherapy, or used in combinationwith other treatments, such as radiation or surgical intervention,either as an adjuvant prior to surgery or post-operatively.

General Reaction Scheme, Intermediates and Examples General ReactionSchemes

The compounds of the present invention may be prepared usingcommercially available reagents and intermediates in the syntheticmethods and reaction schemes described herein, or may be prepared usingother reagents and conventional methods well known to those skilled inthe art.

For instance, intermediates for preparing compounds and compounds ofFormula (I) of the present invention may be prepared according toGeneral Reaction Schemes I-VI:

For General Reaction Scheme I, Compound 5 is an example of Formula (I).In this General Reaction Scheme I, 1 is reacted with an amine such asintermediate 2, this reaction could for example be a nucleophilicsubstitution or a metal catalyzed reaction, to yield Compound 3.Compound 3 can then undergo a metal catalyzed reaction with a couplingpartner, such as a boronic acid derivative, Y—R³ 4 in the presence of asuitable base, e.g., sodium carbonate, to form title compound 5.

For General Reaction Scheme II, Compound 5 is an example of Formula (I).In this General Reaction Scheme II, 6 is reacted with an amine such asintermediate 2, this reaction could for example be a nucleophilicsubstitution or a metal catalyzed reaction, to yield Compound 7.Compound 7 can then undergo a metal catalyzed reaction with a couplingpartner, such as a boronic acid derivative, Y—R¹ 8 in the presence of asuitable base, e.g., sodium carbonate, to form title compound 5.

For General Reaction Scheme III, Compound 5 is an example of Formula(I). In this General Reaction Scheme III, Compound 7 can either undergoa metal catalyzed reaction or a nucleophilic substitution with acoupling partner, such as an alcohol or amine, H—R¹ 9 in the presence ofa suitable base, e.g., cesium carbonate, to form title compound 5.

For General Reaction Scheme IV, Compound 5 is an example of Formula (I).In this General Reaction Scheme IV, Compound 10 is reacted with an aminesuch as intermediate 2, this reaction could for example be anucleophilic substitution or a metal catalyzed reaction, to form titlecompound 5.

For General Reaction Scheme V, Compound 5 is an example of Formula (I).In this General Reaction Scheme V, 11 is reacted with an amine such asintermediate 2, this reaction could for example be a nucleophilicsubstitution or a metal catalyzed reaction, to yield Compound 12.Compound 12 can then undergo a metal catalyzed reaction with a couplingpartner, such as a boronic acid derivative, Y—R³ 4 in the presence of asuitable base, e.g., sodium carbonate, to form compound 7. Compound 7can then undergo a metal catalyzed reaction with a coupling partner,such as a boronic acid derivative, Y—R¹ 8 in the presence of a suitablebase, e.g., sodium carbonate, to form title compound 5.

For General Reaction Scheme VI, Compound 5 is an example of Formula (I).In this General Reaction Scheme VI, Compound 13 can participate in asubstitution reaction with a coupling partner, such as an alcohol,halide, tosylate, or mesylate X—R¹ 14 in the presence of a suitable baseor coupling partner, e.g., cesium carbonate or diethyl azodicarboxylate,to form title compound 5.

The following intermediates may be used to prepare compounds of thepresent invention.

Intermediate A

Step A: To a mixture of 1-(2-bromophenyl)-V-methylmethanamine (6.50 g,32.5 mmol, 1 eq.) in THF (70.0 mL) was added Boc₂O (7.80 g, 35.7 mmol,8.21 mL, 1.10 eq.) dropwise at 25° C., and the mixture was stirred at25° C. for 1 hour. The reaction mixture was directly concentrated invacuo to give a residue. The residue was purified by columnchromatography (SiO₂, petroleum ether/ethyl acetate=20/1 to 10/1) togive tert-butyl (2-bromobenzyl)(methyl)carbamate (7.50 g, 25.0 mmol,76.9% yield) as a colorless oil.

¹H NMR (400 MHz, CDCl₃) δ 7.55 (br d, J=8.0 Hz, 1H), 7.34-7.28 (m, 1H),7.22-7.08 (m, 2H), 4.61-4.42 (m, 2H), 2.94-2.78 (m, 3H), 1.60-1.33 (m,9H).

Step B: A mixture of tert-butyl (2-bromobenzyl)(methyl)carbamate (7.00g, 23.3 mmol, 1.00 eq.), bis(pinacolato)diboron (8.88 g, 35.0 mmol, 1.50eq.), Pd(dppf)Cl₂ (1.71 g, 2.33 mmol, 0.10 eq.) and potassium acetate(5.72 g, 58.3 mmol, 2.50 eq.) in dioxane (80.0 mL) was degassed andpurged with nitrogen for 3 times, and then the mixture was stirred at110° C. for 12 hours under a nitrogen atmosphere. The reaction mixturewas concentrated under reduced pressure to give a residue, and theresidue was purified by column chromatography (SiO₂, petroleumether/ethyl acetate=1/0 to 10/1) to give tert-butylmethyl(2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzyl)carbamate(8.00 g, 23.0 mmol, 98.8% yield) as a colorless oil.

¹H NMR (400 MHz, CDCl₃) δ 7.82 (br d, J=7.2 Hz, 1H), 7.48-7.37 (m, 1H),7.27-7.21 (m, 2H), 4.85-4.63 (m, 2H), 2.92-2.73 (m 3H), 1.54-1.41 (m,9H), 1.35 (s, 12H).

Intermediate B

Step A: To a solution of 1-(4-bromothiophen-2-yl)ethan-1-one (4.00 g,19.5 mmol, 1.10 eq.) and 2-methylpropane-2-sulfinamide (2.15 g, 17.7mmol, 1.00 eq.) in THF (56.0 mL) was added Ti(OEt)₄ (8.09 g, 35.5 mmol,7.35 mL, 2.00 eq.). The mixture was stirred at 70° C. for 2 hours. Themixture was poured into water (15.0 mL) and stirred for 5 minutes. Thesuspension was filtered, and filtrate was concentrated in vacuo to givea residue. The residue was washed with petroleum ether/ethyl acetate=5/1(10 mL), filtered, and filter cake was collected and dried in vacuo togiveN-(1-(4-bromothiophen-2-yl)ethylidene)-2-methylpropane-2-sulfinamide(3.00 g, 9.73 mmol, 54.9% yield) as a yellow solid.

¹H NMR (400 MHz, CDCl₃) δ 7.43 (d, J=1.2 Hz, 1H), 7.41 (d, J=1.2 Hz,1H), 2.72 (s, 3H), 1.30 (s, 9H).

Step B: To a solution ofN-(1-(4-bromothiophen-2-yl)ethylidene)-2-methylpropane-2-sulfinamide(3.70 g, 12.0 mmol, 1.00 eq.) in THF (40.0 mL) was added sodiumborohydride (1.36 g, 36.0 mmol, 3.00 eq.) at 0° C. The reaction mixturewas warmed slowly to 25° C. and stirred for 2 hours. The mixture waspoured into ice-water (15.0 mL) and stirred for 5 minutes at 0° C. Theaqueous phase was extracted with ethyl acetate (30.0 mL×3). The combinedorganic phases were washed with brine (30.0 mL×3), dried over anhydroussodium sulfate, filtered, and concentrated in vacuo to giveN-(1-(4-bromothiophen-2-yl)ethyl)-2-methylpropane-2-sulfinamide (3.60 g,9.51 mmol, 79.3% yield, 82.0% purity) as yellow oil.

¹H NMR (400 MHz, CDCl₃) δ 7.15 (s, 1H), 6.98-6.96 (s, 1H), 4.81-4.75 (m,1H), 3.55 (brd, J=3.6 Hz, 1H), 1.59 (d, J=6.4 Hz, 3H), 1.24 (s, 9H).

Step C: To a solution ofN-(1-(4-bromothiophen-2-yl)ethyl)-2-methylpropane-2-sulfinamide (3.00 g,9.67 mmol, 1.00 eq.) and tert-butylmethyl(2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzyl)carbamate(5.04 g, 14.5 mmol, 1.50 eq.) in dioxane (35.0 mL) and water (8.00 mL)was added Pd(PPh₃)₄ (1.12 g, 967 μmol, 0.10 eq.) and cesium carbonate(9.45 g, 29.01 mmol, 3.00 eq.) under a nitrogen atmosphere. The mixturewas stirred at 110° C. for 2 hours under a nitrogen atmosphere. Themixture was filtered, and the filtrate was concentrated in vacuo to givea residue. The residue was purified by column chromatography (SiO₂,petroleum ether/ethyl acetate=10/1 to 1/1) to give tert-butyl(2-(5-(1-((tert-butylsulfinyl)amino)ethyl)thiophen-3-yl)benzyl)(methyl)carbamate(1.40 g, 3.11 mmol, 32.1% yield) as yellow oil. LCMS [M+1]: 451.2.

Step D: To a solution of tert-butyl(2-(5-(1-((tert-butylsulfinyl)amino)ethyl)thiophen-3-yl)benzyl)(methyl)carbamate(1.40 g, 4.88 mmol, 1.00 eq.) in THF (15.0 mL) and water (5.00 mL) wasadded iodine (232 mg, 1.46 mmol, 295 μL, 0.30 eq.). The mixture wasstirred at 50° C. for 30 minutes. The residue was poured into saturatedsodium sulfite aqueous solution (30.0 mL) and stirred for 5 minutes. Theaqueous phase was extracted with ethyl acetate (15.0 mL×2). The combinedorganic phases were washed with brine (30.0 mL×2), dried over anhydroussodium sulfate, filtered and concentrated in vacuo to give tert-butyl(2-(5-(1-aminoethyl)thiophen-3-yl)benzyl)(methyl)carbamate (1.20 g,crude) as yellow oil.

¹H NMR (400 MHz, CDCl₃) δ 7.36-7.28 (m, 3H), 7.26-7.22 (m, 1H), 7.01 (s,1H), 6.91 (br s, 1H), 4.49 (br d, J=19.2 Hz, 2H), 4.40 (q, J=6.4 Hz,1H), 2.72 (br d, J=19.2 Hz, 3H), 1.53 (d, J=6.4 Hz, 3H), 1.51-1.40 (m,9H).

Intermediates C & D

Step A: To a solution of 4-bromothiophene-2-carbaldehyde (20.0 g, 104mmol, 1.00 eq.) and (R)-2-methylpropane-2-sulfinamide (12.1 g, 99.5mmol, 0.95 eq.) in THF (200 mL) was added titanium (IV) ethoxide (47.8g, 209 mmol, 43.4 mL, 2.00 eq.). The reaction mixture was stirred at 25°C. for 1 hour. The mixture was then poured into water (20.0 mL) andstirred for 5 minutes to give a suspension. The suspension was filteredand the filtered liquor was concentrated in vacuo to give(R,E)-N-((4-bromothiophen-2-yl)methylene)-2-methylpropane-2-sulfinamide(20.0 g, crude) as yellow oil. LCMS [M+1]: 295.8.

Step B: To a solution of(R,E)-N-((4-bromothiophen-2-yl)methylene)-2-methylpropane-2-sulfinamide(600 mg, 2.04 mmol, 1.00 eq.) in THF (200 mL) was added methyl magnesiumbromide (3.00 M, 2.04 mL, 3.00 eq.) dropwise at 0° C. Then the reactionmixture was stirred at 25° C. for 1 hour. Saturated ammonium chlorideaqueous solution (3.00 mL) was added to the reaction mixture and stirredfor 5 minutes. The aqueous phase was extracted with ethyl acetate (3.00mL×2), and the combined organic phases were washed with brine (3.00mL×2), dried over anhydrous sodium sulfate, filtered and concentrated invacuo to give a residue. The residue was purified by prep-TLC (SiO₂,petroleum ether/ethyl acetate=1/1) to give(R)—N—((S)-1-(4-bromothiophen-2-yl)ethyl)-2-methylpropane-2-sulfinamide(first eluting, Intermediate C) (120 mg, 19.0% yield) as yellow oil and(R)—N—((R)-1-(4-bromothiophen-2-yl)ethyl)-2-methylpropane-2-sulfinamide(2^(nd) eluting, Intermediate D) (150 mg, 483 μmol, 23.7% yield) asyellow oil.

Intermediate C: ¹H NMR (400 MHz, CDCl₃) δ 7.15 (d, J=1.6 Hz, 1H), 6.97(s, 1H), 4.81-4.75 (m, 1H), 3.51 (br d, J=3.2 Hz, 1H), 1.59 (d, J=6.8Hz, 3H), 1.24 (s, 9H).

Intermediate D: ¹H NMR (400 MHz, CDCl₃) δ 7.14 (d, J=1.6 Hz, 1H), 6.89(s, 1H), 4.81-4.74 (m, 1H), 3.39 (br d, J=5.6 Hz, 1H), 1.65 (d, J=6.8Hz, 3H), 1.25 (s, 9H).

Intermediate E

Step A: To a solution of(R)—N—((R)-1-(4-bromothiophen-2-yl)ethyl)-2-methylpropane-2-sulfinamide(150 mg, 483 μmol, 1.00 eq.) and tert-butylmethyl(2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzyl)carbamate(168 mg, 483 μmol, 1.00 eq.) in dioxane (1.00 mL) and water (0.20 mL)was added Pd(PPh₃)₄ (55.9 mg, 48.3 μmol, 0.10 eq.) and cesium carbonate(473 mg, 1.45 mmol, 3.00 eq.) under a nitrogen atmosphere. The reactionmixture was stirred at 110° C. for 2 hours under a nitrogen atmosphere,then to 25° C. and concentrated in vacuo to give a residue. The residuewas purified by prep-TLC (SiO₂, petroleum ether/ethyl acetate=1/1) togive tert-butyl(2-(5-((R)-1-(((R)-tert-butylsulfinyl)amino)ethyl)thiophen-3-yl)benzyl)(methyl)carbamate(120 mg, 266 μmol, 55.1% yield) as a white solid. LCMS [M+1]=451.1.

¹H NMR (400 MHz, CDCl₃) δ 7.37-7.29 (m, 3H), 7.25 (s, 1H), 7.06 (s, 1H),6.95 (br s, 1H), 4.88-4.81 (m, 1H), 4.48 (br d, J=16.0 Hz, 2H), 3.44 (brd, J=6.0 Hz, 1H), 2.73 (br d, J=12.8 Hz, 3H), 1.71 (d, J=6.4 Hz, 3H),1.27 (s, 9H), 1.25 (s, 9H).

Step B: To a solution of tert-butyl(2-(5-((R)-1-(((R)-tert-butylsulfinyl)amino)ethyl)thiophen-3-yl)benzyl)(methyl)carbamate(120 mg, 266 μmol, 1.00 eq.) in THF (1.00 mL) and water (0.20 mL) wasadded iodine (20.3 mg, 79.9 μmol, 16.1 μL, 0.30 eq.), and the reactionmixture was stirred at 50° C. for 1 hour. The reaction mixture was thencooled to 25° C., poured into saturated sodium sulfite aqueous solution(2.00 mL) and stirred for 5 minutes. The aqueous phase was extractedwith ethyl acetate (3.00 mL×3), and the combined organic phases werewashed with brine (3.00 mL×3), dried over anhydrous sodium sulfate,filtered, and concentrated in vacuo to give a residue. The residue waspurified by prep-HPLC (column: Phenomenex Gemini-NX C18 75×30 mm×3 um;mobile phase: [water (0.1% TFA)-ACN]; B %: 28%-38%) to give tert-butyl(R)-(2-(5-(1-aminoethyl)thiophen-3-yl)benzyl)(methyl)carbamate (40.0 mg,113 μmol, 42.3% yield, 97.5% purity) as white oil.

¹H NMR (400 MHz, CD₃OD) δ 7.41-7.23 (m, 6H), 4.84-4.79 (m, 1H), 4.48 (s,2H), 2.73 (s, 3H), 1.76 (d, J=6.8 Hz, 3H), 1.51-1.36 (m, 9H).

Intermediate F

Step A: To a solution of(R)—N—((S)-1-(4-bromothiophen-2-yl)ethyl)-2-methylpropane-2-sulfinamide(100 mg, 322 μmol, 1.00 eq.) and tert-butylmethyl(2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzyl)carbamate(112 mg, 322 μmol, 1.00 eq.) in dioxane (1.00 mL) and water (0.20 mL)was added Pd(PPh₃)₄ (37.2 mg, 32.2 μmol, 0.10 eq.) and cesium carbonate(315 mg, 967 ummol, 3.00 eq.) under a nitrogen atmosphere. The reactionmixture was stirred at 110° C. for 2 hours, then cooled to 25° C. andconcentrated in vacuo to give a residue. The residue was purified byprep-TLC (SiO₂, petroleum ether/ethyl acetate=1/1) to give tert-butyl(2-(5-((S)-1-(((R)-tert-butylsulfinyl)amino)ethyl)thiophen-3-yl)benzyl)(methyl)carbamate(100 mg, 266 μmol, 68.9% yield) as yellow oil. LCMS [M+1]=451.1.

¹H NMR (400 MHz, CDCl₃) δ 7.37-7.28 (m, 3H), 7.26-7.22 (m, 1H), 7.07 (d,J=1.2 Hz, 1H), 7.03 (br s, 1H), 4.90-4.83 (m, 1H), 4.55-4.41 (m, 2H),3.71-3.55 (m, 1H), 2.80-2.65 (m, 3H), 1.64 (d, J=6.8 Hz, 3H), 1.52-1.41(m, 9H), 1.26 (s, 9H).

Step B: To a solution of tert-butyl(2-(5-((S)-1-(((R)-tert-butylsulfinyl)amino)ethyl)thiophen-3-yl)benzyl)(methyl)carbamate(100 mg, 266 μmol, 1.00 eq.) in THF (1.00 mL) and water (0.20 mL) wasadded iodine (16.9 mg, 66.6 μmol, 13.4 μL, 0.30 eq.). The reactionmixture was stirred at 50° C. for 1 hour, thens cooled to 25° C. andpoured into saturated aqueous sodium sulfite (2.00 mL) solution andstirred for 5 minutes. The aqueous phase was extracted with ethylacetate (3.00 mL×3), and the combined organic phases were washed withbrine (3.00 mL×3), dried over anhydrous sodium sulfate, filtered, andconcentrated in vacuo to give a residue. The residue was purified byprep-HPLC (column: Phenomenex Luna C18 150×25 mm×10 um; mobile phase:[water(0.1% TFA)-ACN]; B %: 24%-54%) to give tert-butyl(S)-(2-(5-(1-aminoethyl)thiophen-3-yl)benzyl)(methyl)carbamate (45.0 mg,97.7 μmol, 44.0% yield, TFA salt) as white oil. LCMS [M+1]=347.2.

¹H NMR (400 MHz, CD₃OD) δ 7.40 (d, J=1.2 Hz, 1H), 7.38-7.22 (m, 5H),4.82-4.80 (br s, 1H), 4.48 (s, 2H), 2.73 (s, 3H), 1.75 (d, J=6.8 Hz,3H), 1.50-1.35 (m, 9H).

Intermediate G

Step A: To a solution of 2-methyl-3-(trifluoromethyl)benzaldehyde (300mg, 1.59 mmol, 1.00 eq.) and 2-methylpropane-2-sulfinamide (213 mg, 1.75mmol, 1.10 eq.) in THF (5.00 mL) was added titanium (IV) ethoxide (727mg, 3.19 mmol, 661 μL, 2.00 eq.). The reaction mixture was stirred at25° C. for 12 hours. The reaction mixture was poured into water (2.00mL) and stirred for 5 minutes to give a suspension. The suspension wasfiltered and concentrated in vacuo to give2-methyl-N-(2-methyl-3-(trifluoromethyl)benzylidene)propane-2-sulfinamide(360 mg, 1.24 mmol, 77.5% yield) as a white solid.

¹H NMR (400 MHz, CDCl₃) δ=8.98 (s, 1H), 8.13 (d, J=7.6 Hz, 1H), 7.78 (d,J=7.6 Hz, 1H), 7.40 (t, J=7.6 Hz, 1H), 2.70 (d, J=0.8 Hz, 3H), 1.29 (s,9H).

Step B: To a solution of2-methyl-N-(2-methyl-3-(trifluoromethyl)benzylidene)propane-2-sulfinamide(185 mg, 635 μmol, 1.00 eq.) in THF (5.00 mL) was added dropwise methylmagnesium bromide (227 mg, 3.00 M, 635 μL, 3.00 eq.) at 0° C. under anitrogen atmosphere. The reaction mixture was stirred at 25° C. for 3hours then treated with saturated ammonium chloride solution (10.0 mL)slowly. The organic layer and aqueous phase were separated, and theaqueous phase was extracted with ethyl acetate (5.00 mL×3). The combinedorganic layers were washed with brine (10.0 mL), dried over anhydroussodium sulfate, filtered, and concentrated to give a residue. Theresidue was purified by column chromatography (SiO₂, petroleumether/ethyl acetate=10/1 to 1/1) to give2-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)propane-2-sulfinamide(150 mg, 488.0 μmol, 76.8% yield) as a yellow solid.

¹H NMR (400 MHz, CDCl₃) δ=7.65-7.54 (m, 4H), 7.35-7.28 (m, 2H),5.00-4.87 (m, 2H), 2.49 (s, 6H), 1.54-1.50 (m, 6H), 1.26-1.24 (m, 9H),1.22 (s, 9H).

Step C: To a solution of2-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)propane-2-sulfinamide(150 mg, 488.0 μmol, 1.00 eq.) in HCl (4.0 M in dioxane, 1.00 mL) wasstirred at 25° C. for 1 hour. The reaction mixture was filtered andfilter cake was concentrated in vacuo to give1-(2-methyl-3-(trifluoromethyl)phenyl)ethan-1-amine (45.0 mg, 38.5%yield) as a red solid. LCMS [M+1]=204.3.

¹H NMR (400 MHz, CD₃OD) δ=7.78-7.65 (m, 2H), 7.56-7.48 (m, 1H),4.93-4.89 (m, 1H), 2.52 (d, J=0.8 Hz, 3H), 1.63 (d, J=6.8 Hz, 3H).

Intermediate H

Step A: To a solution of1-(2-methyl-3-(trifluoromethyl)phenyl)ethan-1-one (8.00 g, 39.6 mmol,1.00 eq.) and (R)-2-methylpropane-2-sulfinamide (5.28 g, 43.5 mmol, 1.10eq.) in THF (80.0 mL) was added titanium (IV) ethoxide (18.1 g, 79.1mmol, 16.4 mL, 2.00 eq.). The reaction mixture was stirred at 70° C. for2 hours. The reaction mixture was cooled at 25° C. and poured intoice-water (w/w=1/1) (80.0 mL) and stirred for 15 minutes to give asuspension. The suspension was filtered, the filtrate was extracted withethyl acetate (50.0 mL×3). The combined organic phases were washed withbrine (30.0 mL×3), dried over anhydrous sodium sulfate, filtered, andconcentrated in vacuo to give a residue. The residue was purified bycolumn chromatography (SiO₂, petroleum ether/ethyl acetate=20/1 to 3/1)to givetert-2-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethylidene)propane-2-sulfinamide(8.00 g, 26.2 mmol, 66.2% yield) as yellow oil. LCMS [M+1]: 306.2.

¹H NMR (400 MHz, CD₃OD) δ 7.74 (br t, J=7.2 Hz, 2H), 7.57-7.51 (m, 1H),7.46 (br t, J=7.6 Hz, 2H), 7.43-7.30 (m, 1H), 2.72 (s, 3H), 2.54 (J=6.8Hz, 3H), 2.48 (s, 3H), 2.40 (br d, J=16.0 Hz, 3H), 1.31 (s, 9H), 1.24(br d, J=12.4 Hz, 9H).

Step B: To a solution ofS)-2-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethylidene)propane-2-sulfinamide(8.00 g, 26.2 mmol, 1.00 eq.) in THF (80.0 mL) was added L-selectride(7.47 g, 39.3 mmol, 8.59 mL, 1.50 eq.) dropwise at −78° C. The reactionmixture was stirred at −78° C. for 2 hours. Water was added dropwise tothe reaction mixture (10.0 mL) at 0° C. and the resulting mixture wasstirred for 5 minutes. The aqueous phase was extracted with ethylacetate (30.0 mL×3). The combined organic phases were washed with brine(30.0 mL×2), dried over anhydrous sodium sulfate, filtered, andconcentrated in vacuo to give a residue. The residue was purified bycolumn chromatography (SiO₂, petroleum ether/ethyl acetate=20/1 to 3/1)to giveCV)-2-methyl-N—((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)propane-2-sulfinamide(3.50 g, 11.4 mmol, 43.5% yield) as yellow oil. LCMS [M+1]: 308.0.

¹H NMR (400 MHz, CD₃OD) δ=7.70 (d, J=8.0 Hz, 1H), 7.57 (d, J=1.6 Hz,1H), 7.39-7.33 (m, 1H), 4.94-4.88 (m, 1H), 2.48 (d, J=1.2 Hz, 3H), 1.54(d, J=6.4 Hz, 3H), 1.20 (s, 9H).

Step C: A solution ofS)-2-methyl-N—((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)propane-2-sulfinamide(1.30 g, 4.23 mmol, 1.00 eq.) in HCl (4M in dioxane, 15.0 mL) wasstirred at 25° C. for 30 minutes. The reaction mixture was filtered andfilter cake dried in vacuo to give(R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethan-1-amine (700 mg, 2.89mmol, 68.4% yield, 99.1% purity, hydrochloride) as a white solid. LCMS[M+H]: 204.0.

¹H NMR (400 MHz, CD₃OD) δ=7.73 (t, J=7.6 Hz, 2H), 7.54-7.49 (m, 1H),4.92-4.88 (m, 1H), 2.52 (d, J=0.8 Hz, 3H), 1.62 (d, J=6.8 Hz, 3H).

Intermediate I

Step A: To a solution of 1-(5-bromothiophen-2-yl)ethan-1-one (11.0 g,53.6 mmol, 1.00 eq.) in THF (120 mL) was added2-methylpropane-2-sulfinamide (8.45 g, 69.7 mmol, 1.30 eq.) and titanium(IV) ethoxide (24.5 g, 107 mmol, 22.3 mL, 2.00 eq.), the reactionmixture was stirred at 75° C. for 12 hours under a nitrogen atmosphere.The reaction mixture was cooled to 25° C. and concentrated in vacuo togive a residue, the residue was diluted with water (200 mL) and ethylacetate (200 mL), filtered, and the filtrate was extracted with ethylacetate (100 mL×3). The combined organic layers were washed with brine(300 mL), dried over anhydrous sodium sulfate, filtered, andconcentrated under reduced pressured to giveA-(1-(5-bromothiophen-2-yl)ethylidene)-2-methylpropane-2-sulfinamide(16.0 g, crude) as a yellow solid. LCMS [M+1]: 308.0.

Step B: To a solution ofA-(1-(5-bromothiophen-2-yl)ethylidene)-2-methylpropane-2-sulfinamide(16.0 g, 51.9 mmol, 1.00 eq.) in THF (150 mL) was added sodiumborohydride (3.93 g, 104 mmol, 2.00 eq.) at 0° C., the reaction mixturewas stirred at 20° C. for 1 hour. Saturated sodium bicarbonate aqueoussolution (20.0 mL) was added to the reaction mixture dropwise, then themixture was diluted with water (200 mL) and extracted with ethyl acetate(100 mL×3). The combined organic layers were dried over anhydrous sodiumsulfate, filtered, and concentrated in vacuo to give a residue. Theresidue was purified by column chromatography (SiO₂, petroleumether/ethyl acetate=30/1 to 2/1) to giveN-(1-(5-bromothiophen-2-yl)ethyl)-2-methylpropane-2-sulfinamide (12.0 g,38.7 mmol, 74.5% yield) as a yellow oil. LCMS [M+1]: 309.9.

Intermediate J

Step A: To a solution of 1-(5-bromothiophen-2-yl)ethan-1-one (10.0 g,48.8 mmol, 1.00 eq.) and (R)-2-methylpropane-2-sulfinamide (7.68 g, 63.4mmol, 1.30 eq.) in THF (120 mL) was added titanium (IV) ethoxide (22.3g, 97.5 mmol, 20.2 mL, 2.00 eq.), the reaction mixture was stirred at70° C. for 12 hours under a nitrogen atmosphere. The reaction mixturewas cooled to 25° C., diluted with water (200 mL) and ethyl acetate (100mL) to give a suspension, the suspension was filtered and the filtratewas extracted with ethyl acetate (100 mL×3). The combined organic layerswere dried over sodium sulfate, filtered, and concentrated under reducedpressure to give (R,E)-N-(1-(5-bromothiophen-2-yl)ethylidene)-2-methylpropane-2-sulfinamide(13.0 g, crude) as a brown oil. LCMS [M+1]: 308.2.

¹H NMR (400 MHz, CDCl₃) δ=7.23 (d, J=4.0 Hz, 1H), 7.04 (d, J=4.0 Hz,1H), 2.67 (s, 3H), 1.28 (s, 9H).

Step B: To a solution of(R,E)-N-(1-(5-bromothiophen-2-yl)ethylidene)-2-methylpropane-2-sulfinamide(13.0 g, 42.2 mmol, 1.00 eq.) in THF (150 mL) was added sodiumborohydride (4.79 g, 127 mmol, 3.00 eq.) at 0° C. The reaction mixturewas stirred at 20° C. for 2 hours under a nitrogen atmosphere. Saturatesodium bicarbonate aqueous solution (20.0 mL) was added to the mixturedropwise and diluted with water (200 mL), the resulting aqueous solutionwas extracted with ethyl acetate (100 mL×3), the combined organic layerswere dried over sodium sulfate, filtered, and concentrated under vacuumto give a residue. The residue was purified by column chromatography(SiO₂, petroleum ether/ethyl acetate=30/1 to 2/1) to give(R)—N—((R)-1-(5-bromothiophen-2-yl)ethyl)-2-methylpropane-2-sulfinamide(6.00 g, 17.4 mmol, 41.3% yield, 90.0% purity) as a brown solid. LCMS[M+1]: 309.9.

¹H NMR (400 MHz, CDCl₃) δ=6.90 (d, J=3.6 Hz, 1H), 6.80 (d, J=3.6 Hz,1H), 4.84-4.66 (m, 1H), 3.50 (d, J=2.8 Hz, 1H), 1.57 (d, J=6.4 Hz, 3H),1.23 (s, 9H).

Step C: To a solution of(R)—N—((R)-1-(5-bromothiophen-2-yl)ethyl)-2-methylpropane-2-sulfinamide(2.00 g, 6.45 mmol, 1.00 eq.) and tert-butylmethyl(2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzyl)carbamate(2.69 g, 7.74 mmol, 1.20 eq.) in dioxane (20.0 mL) and water (2.00 mL)was added cesium carbonate (6.30 g, 19.3 mmol, 3.00 eq.) and Pd(PPh₃)₄(745 mg, 645 μmol, 0.10 eq.) under a nitrogen atmosphere. The reactionmixture was stirred at 110° C. for 2 hours under a nitrogen atmosphere.The reaction mixture was then cooled to 25° C., diluted with water (100mL), and extracted with ethyl acetate (50.0 mL×3). The combined organiclayers were dried over sodium sulfate, filtered, and concentrated underreduced pressure to give a residue. The residue was purified by columnchromatography (SiO₂, petroleum ether/ethyl acetate=20/1 to 1/1) to givetert-butyl(2-(5-((R)-1-(((R)-tert-butylsulfinyl)amino)ethyl)thiophen-2-yl)benzyl)(methyl)carbamate(2.60 g, 5.19 mmol, 80.6% yield, 90.0% purity) as a yellow oil. LCMS[M+1]: 451.4.

¹H NMR (400 MHz, CDCl₃) δ=7.40-7.32 (m, 2H), 7.31-7.27 (m, 1H),7.26-7.22 (m, 1H), 7.01 (s, 1H), 6.83 (s, 1H), 4.95-4.79 (m, 1H),4.67-4.44 (m, 2H), 3.56 (d, J=3.2 Hz, 1H), 2.93-2.56 (m, 3H), 1.64 (d,J=6.4 Hz, 3H), 1.56-1.36 (m, 9H), 1.26 (s, 9H).

Step D: To a solution of tert-butyl(2-(5-((R)-1-(((R)-tert-butylsulfinyl)amino)ethyl)thiophen-2-yl)benzyl)(methyl)carbamate(2.60 g, 5.77 mmol, 1.00 eq.) in THF (20.0 mL) and water (4.00 mL) wasadded iodine (439 mg, 1.73 mmol, 349 μL, 0.30 eq.), the reaction mixturewas stirred at 50° C. for 2 hours. The reaction mixture was cooled to25° C., diluted with saturate sodium bicarbonate (50.0 mL) and extractedwith ethyl acetate (20.0 mL×3). The combined organic layers were driedover sodium sulfate, filtered, and concentrated under reduced pressureto give a residue. The residue was purified by column chromatography(SiO₂, petroleum ether/ethyl acetate=10/1 to 0/1) to give (R)-tert-butyl(R)-(2-(5-(1-aminoethyl)thiophen-2-yl)benzyl)(methyl)carbamate (1.50 g,3.68 mmol, 63.8% yield, 85.0% purity) as a yellow oil. LCMS [2M+1]:693.3.

¹H NMR (400 MHz, CDCl₃) δ=7.39-7.31 (m, 2H), 7.30-7.20 (m, 2H), 7.01 (d,J=2.8 Hz, 1H), 6.81 (d, J=3.2 Hz, 1H), 4.61-4.48 (m, 3H), 4.04 (s, 2H),2.73 (s, 3H), 1.64 (d, J=6.4 Hz, 3H), 1.57-1.33 (m, 9H).

Intermediate K

Step A: To a solution ofA-(1-(5-bromothiophen-2-yl)ethyl)-2-methylpropane-2-sulfinamide (0.50 g,1.61 mmol, 1.00 eq.) and N,N-dimethyl-1-(2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)methanamine(505 mg, 1.93 mmol, 1.20 eq.) in dioxane (5.00 mL) and water (0.50 mL)was added cesium carbonate (1.58 g, 4.83 mmol, 3.00 eq.) and Pd(PPh₃)₄(186 mg, 161 μmol, 0.10 eq.), then degassed and purged with nitrogen 3times. The reaction mixture was stirred at 110° C. for 2 hours under anitrogen atmosphere. Upon completion, the reaction mixture was cooled to25° C., diluted with water (50.0 mL) and extracted with ethyl acetate(20.0 mL×3). The combined organic layers were dried over anhydroussodium sulfate, filtered, and concentrated under reduced pressure togive a residue. The residue was purified by column chromatography (SiO₂,petroleum ether/ethyl acetate=20/1 to 0/1) to giveN-(1-(5-(2-((dimethylamino)methyl)phenyl)thiophen-2-yl)ethyl)-2-methylpropane-2-sulfinamide(450 mg, 1.15 mmol, 71.3% yield, 93.0% purity) as a brown oil. LCMS[M+1]: 365.2.

Step B: To a solution ofN-(1-(5-(2-((dimethylamino)methyl)phenyl)thiophen-2-yl)ethyl)-2-methylpropane-2-sulfinamide(410 mg, 1.12 mmol, 1.00 eq.) in THF (4.00 mL) was added hydrochloricacid (3.00 M, 375 μL, 1.00 eq.), the reaction mixture was stirred at 20°C. for 2 hours. Upon completion, the reaction mixture was diluted withsaturated sodium bicarbonate (50.0 mL) and extracted with ethyl acetate(20.0 mL×3). The combined organic layers were dried over anhydroussodium sulfate, filtered, and concentrated under reduced pressure togive a residue. The residue was purified by column chromatography (SiO₂,petroleum ether/ethyl acetate=10/1 to dichloromethane/methanol=10/1) togive 1-(5-(2-((dimethylamino)methyl)phenyl)thiophen-2-yl)ethanamine (200mg, 691 μmol, 61.5% yield, 90.0% purity) as a yellow oil.

¹H NMR (400 MHz, DMSO-d₆) δ=7.48-7.42 (m, 1H), 7.41-7.36 (m, 1H),7.34-7.28 (m, 2H), 7.13 (d, J=3.6 Hz, 1H), 6.96-6.92 (m, 1H), 4.29-4.21(m, 1H), 3.39 (s, 2H), 2.14 (s, 6H), 1.38 (d, J=6.4 Hz, 3H).

Intermediate L

Step A: To a solution of 6-chlorofuro[3,4-c]pyridin-1(3H)-one (1.50 g,8.85 mmol, 1.00 eq.) in carbon tetrachloride (10.0 mL) was added AIBN(145 mg, 884 μmol, 0.10 eq.) and NBS (1.42 g, 7.96 mmol, 0.9 eq.). Thereaction mixture was stirred at 80° C. for 12 hours. The reaction wasfiltered and the filtrate was concentrated under vacuum to give aresidue. The residue was purified by column chromatography (SiO₂,petroleum ether/ethyl acetate=50/1 to 10/1) to give3-bromo-6-chlorofuro[3,4-c]pyridin-1(3H)-one (1.20 g, 4.83 mmol, 54.6%yield) as yellow oil. LCMS [M+3]: 249.8.

¹H NMR (400 MHz, CDCl₃) δ=8.84-8.80 (m, 1H), 7.84 (s, 1H), 7.47 (s, 1H).

Step B: To a solution of 3-bromo-6-chlorofuro[3,4-c]pyridin-1(3H)-one(1.20 g, 4.83 mmol, 1.00 eq.) in ethanol (20.0 mL) was added hydrazinehydrate (370 mg, 7.24 mmol, 359 μL, 1.50 eq.) at 0° C. The reactionmixture was stirred at 80° C. for 30 minutes. The reaction was cooled to25° C., poured into ice water (1.00 mL) to give a suspension. Thesuspension was filtered, and the filter cake was collected and driedunder vacuum to give 7-chloropyrido[3,4-d]pyridazin-1-ol (800 mg, 4.41mmol, 91.2% yield) as a yellow solid. LCMS [M+1]⁺: 182.0.

¹H NMR (400 MHz, DMSO-d₆) δ=13.08 (br s, 1H), 9.20 (s, 1H), 8.53 (s,1H), 8.10 (s, 1H).

Step C: To a solution of 7-chloropyrido[3,4-d]pyridazin-1-ol (78.0 mg,430 μmol, 1.00 eq.) in acetonitrile (2.00 mL) was added phosphorus (V)oxychloride (231 mg, 1.50 mmol, 139 μL, 3.50 eq.) at 25° C. The reactionmixture was stirred at 80° C. for 2 hours. The reaction was cooled at25° C., poured into saturated sodium bicarbonate aqueous solution (2.00mL) and stirred for 5 minutes at 0° C. The aqueous phase was extractedwith ethyl acetate (3.00 mL×3). The combined organic phases were washedwith brine (2.00 mL×3), dried over anhydrous sodium sulfate, filtered,and concentrated in vacuo to give 1,7-dichloropyrido[3,4-d]pyridazine(65.0 mg, crude) as a red solid. LCMS [M+1]: 199.8.

Intermediate M

Step A: To a mixture of methyl 3,4-dimethoxybenzoate (10.0 g, 51.0 mmol,1.00 eq.) in acetic acid (50.0 mL) was added bromine (8.96 g, 56.1 mmol,2.89 mL, 1.10 eq.) in acetic acid (50.0 mL) at 0° C. over 1.5 hours. Themixture was then slowly brought to room temperature and stirred for 45minutes. Upon completion, the reaction was quenched by pouring intowater (700 mL) and stirred for 30 minutes, then stirring was stopped andthe mixture was filtered after 1 hr of sitting. The collected solid waswashed with water (100 mL) and washed with sodium sulfite aqueoussolution (100 mL). The solid was partially dried, dissolved in hotmethanol (300 mL), and the resultant solution was cooled. The coolmethanolic solution was treated with water (200 mL) to give asuspension, the suspension was filtered, the filter cake was collectedand dried in vacuo to give methyl 2-bromo-4,5-dimethoxybenzoate (9.00 g,32.7 mmol, 64.2% yield) as a white powder. LCMS [M+1]: 275.3.

¹H NMR (400 MHz, DMSO-d₆) δ=7.36 (s, 1H), 7.24 (s, 1H), 3.84 (s, 3H),3.82 (s, 3H), 3.79 (s, 3H).

Step B: A mixture of methyl 2-bromo-4,5-dimethoxy-benzoate (6.00 g, 21.8mmol, 1.00 eq.), 1-(vinyloxy)butane (10.9 g, 109 mmol, 14.0 mL, 5.00eq.), Pd(OAc)₂ (490 mg, 2.18 mmol, 0.10 eq.), triphenylphosphine (1.14g, 4.36 mmol, 0.20 eq.) and triethylamine (2.65 g, 26.2 mmol, 3.64 mL,1.20 eq.) in acetonitrile (60.0 mL) was degassed and purged withnitrogen 3 times, and then the reaction mixture was stirred at 100° C.for 16 hours under a nitrogen atmosphere. The mixture was then cooled to25° C., filtered, and the filtrate concentrated under reduced pressureto give methyl methyl 2-(1-butoxyvinyl)-4,5-dimethoxybenzoate (6.00 g,crude) was obtained as a yellow oil which was used in the next stepdirectly.

Step C: A mixture of methyl 2-(1-butoxyvinyl)-4,5-dimethoxybenzoate(6.00 g, 20.4 mmol, 1.00 eq.) in hydrochloric acid (10% in water, 61.2g, 168 mmol, 60.0 mL, 8.23 eq.) and THF (60.0 mL) was stirred at 20° C.for 1 hour. The reaction mixture was diluted with water (100 mL) andextracted with ethyl acetate (50.0 mL×3). The combined organic layerswere brought to pH=7 with a saturated sodium bicarbonate aqueoussolution, then the organic layers were washed with brine (100 mL), driedover anhydrous sodium sulfate, filtered, and concentrated under reducedpressure to give a residue. The residue was triturated with petroleumether/ethyl acetate=5/1 (50.0 mL) at 20° C. for 20 minutes to give asuspension, the suspension was filtered, the filter cake was collectedand dried in vacuo to give methyl 2-acetyl-4,5-dimethoxybenzoate (3.00g, 12.6 mmol, 61.8% yield) as a white solid.

1H NMR (400 MHz, DMSO-d6) δ=7.26 (s, 1H), 7.17 (s, 1H), 3.86 (s, 3H),3.84 (s, 3H), 3.77 (s, 3H), 2.46 (s, 3H).

Step D: To a solution of methyl 2-acetyl-4,5-dimethoxybenzoate (3.00 g,12.6 mmol, 1.00 eq.) in ethanol (30.0 mL) was added hydrazine hydrate(2.22 g, 37.8 mmol, 2.16 mL, 3.00 eq.) at room temperature, and then thereaction mixture was stirred at 95° C. for 30 minutes. The reactionmixture was diluted with water (100 mL) and extracted with ethyl acetateseveral times. The combined organic layers were washed with brine (100mL), dried over anhydrous sodium sulfate, filtered, and concentratedunder reduced pressure to give a residue. The residue was trituratedwith ethyl acetate (50.0 mL) at 20° C. for 20 minutes to give asuspension, the suspension was filtered, the filter cake was collectedand dried in vacuo to give 6,7-dimethoxy-4-methylphthalazin-1(2H)-one(2.00 g, 9.08 mmol, 72.1% yield) as a off-white solid. LCMS [M+1]:221.4.

1H NMR (400 MHz, DMSO-d6) δ=12.25 (s, 1H), 7.58 (s, 1H), 7.21 (s, 1H),3.96 (s, 3H), 3.92 (s, 3H), 2.48 (s, 3H).

Step E: A mixture of 6,7-dimethoxy-4-methylphthalazin-1(2H)-one (1.30 g,5.90 mmol, 1.00 eq.) in phosphorus (V) oxychloride (13.0 mL) was stirredat 120° C. for 12 hours. The reaction mixture was concentrated underreduced pressure to give 1-chloro-6,7-dimethoxy-4-methylphthalazine(1.20 g, crude) as a yellow solid. LCMS [M+1]: 239.0.

1H NMR (400 MHz, DMSO-d6) δ=7.80 (s, 1H), 7.64 (s, 1H), 4.13 (s, 3H),4.12 (s, 3H), 3.08 (s, 3H).

Intermediate N

Step A: To a solution of1-(3-(difluoromethyl)-2-methylphenyl)ethan-1-one (0.37 g, 1.99 mmol,1.00 eq.) in tetrahydrofuran (10.0 mL) was added titanium(IV) ethoxide(2.27 g, 9.95 mmol, 2.06 mL, 5.00 eq.) and(R)-2-methylpropane-2-sulfinamide (724 mg, 5.97 mmol, 3.00 eq.). Themixture was stirred at 75° C. for 16 hours. The reaction mixture wasquenched by addition saturated aqueous sodium bicarbonate 20.0 mL at 25°C. The mixture was filtered, and filtrate was extracted with ethylacetate 45.0 mL (15.0 mL×3). The combined organic layers were washedwith brine 20.0 mL (20.0 mL×1), dried over anhydrous sodium sulfate,filtered, and concentrated under reduced pressure to give a residue. Theresidue was purified by flash silica gel chromatography (0-12% Ethylacetate/Petroleum ether) to give(R,E)-N-(1-(3-(difluoromethyl)-2-methylphenyl)ethylidene)-2-methylpropane-2-sulfinamide(0.36 g, 1.19 mmol, 59.8% yield, 95.0% purity) as a colorless oil.

¹H NMR (400 MHz, CD₃OD) δ=7.55-7.62 (m, 1H), 7.16-7.51 (m, 2H),6.79-7.13 (m, 1H), 2.48-2.73 (m, 3H), 2.27-2.47 (m, 3H), 1.19-1.30 (m,9H).

Step B: To a solution of(R,E)-N-(1-(3-(difluoromethyl)-2-methylphenyl)ethylidene)-2-methylpropane-2-sulfinamide(340 mg, 1.18 mmol, 1.00 eq.) in tetrahydrofuran (5.00 mL) was addedsodium borohydride (89.5 mg, 2.37 mmol, 2.00 eq.). The mixture wasstirred at 0° C. for 1 hour. The reaction mixture was quenched byaddition water 10.0 mL at 25° C., and then extracted with ethyl acetate30.0 mL (10.0 mL×3). The combined organic layers were washed with brine(10.0 mL×1) dried over anhydrous sodium sulfate, filtered, andconcentrated under reduced pressure to give a residue. The residue waspurified by flash silica gel chromatography (0-13% Ethylacetate/Petroleum ether) to give(R)—N—((R)-1-(3-(difluoromethyl)-2-methylphenyl)ethyl)-2-methylpropane-2-sulfinamide(190 mg, 643 μmol, 54.4% yield, 98.0% purity) as a yellow oil. LCMS[M+1]⁺=290.1.

Step C: A mixture of (R)—N—((R)-1-(3-(difluoromethyl)-2-methylphenyl)ethyl)-2-methylpropane-2-sulfinamide (140 mg, 484 μmol, 1.00 eq.)in dioxane hydrochloride (4.00 M, 7.00 mL, 57.9 eq) was stirred at 25°C. for 1 h. The reaction mixture was concentrated under reduced pressureto give crude product(R)-1-(3-(difluoromethyl)-2-methylphenyl)ethan-1-amine (110 mg, 475μmol, 98.2% yield, 80.0% purity) as a white solid, which was usedwithout further purification. LCMS [M+1]⁺=186.0.

Intermediate O

Step A: To a solution of 3-bromo-2-methylbenzoic acid (100 g, 465 mmol,1.00 eq.) and N O-dimethylhydroxylamine hydrochloride (68.6 g, 512 mmol,1.10 eq., HCl) inDMF (1000 mL) was added1-[Bis(dimethylamino)methylene]-1H-1,2,3-triazolo[4,5-b]pyridinium3-oxid hexafluorophosphate (195 g, 512 mmol, 1.10 eq.) andN,N-diisopropylethylamine (180 g, 1.40 mol, 243 mL, 3.00 eq.). Themixture was stirred at 25° C. for 2 hours, then poured into water (1000mL) and stirred for 15 minutes. The aqueous phase was extracted withethyl acetate (1000 mL×3). The combined organic phases were washed withbrine (1000 mL×5), dried over anhydrous sodium sulfate, filtered andconcentrated in vacuo to give 3 3-bromo-N-methoxy-N,2-dimethylbenzamide(120 g, crude) as yellow oil. LCMS [M+1]⁺: 258.0.

Step B: To a solution of 33-bromo-N-methoxy-N,2-dimethylbenzamide (120g, 465 mmol, 1.00 eq.) in THF (100 mL) was added methyl magnesiumbromide (3.0 M, 180 mL, 1.16 eq.) at 0° C. The mixture was stirredbetween 0-40° C. for 3 hours, then the mixture was cooled to 0° C. andhydrochloric acid (6.0 N) (450 mL) was added dropwise, and stirred for 2hours between 40-45° C. Then the mixture was cooled to 25° C. and pouredinto a saturated ammonium chloride solution (9000 mL). The aqueous phasewas extracted with ethyl acetate (1500 mL×3). The combined organic phasewas washed with brine (1000 mL×3), dried over anhydrous sodium sulfate,filtered, and concentrated under vacuum to give1-(3-bromo-2-methylphenyl)ethan-1-one (90.0 g, 422 mmol, 90.9% yield) asyellow oil.

¹H NMR (400 MHz, CD₃OD) δ=7.70 (dd, J=1.2, 8.0 Hz, 1H), 7.62 (dd, J=0.8,7.6 Hz, 1H), 7.19 (t, J=8.0 Hz, 1H), 2.56 (s, 3H), 2.46 (s, 3H).

Step C: To a solution of 1-(3-bromo-2-methylphenyl)ethan-1-one (88.0 g,413 mmol, 1.00 eq.) and (<S)-2-methylpropane-2-sulfinamide (60.1 g, 496mmol, 1.20 eq.) in THF (100 mL) was added titanium (IV) ethoxide (471 g,2.07 mol, 428 mL, 5.00 eq.) and diglyme (55.4 g, 413 mmol, 59.1 mL, 1.00eq.). The mixture was stirred at 80° C. for 2 hours then poured intowater (300 mL) and stirred for 15 minutes. The mixture was then filteredand concentrated in vacuo to give a residue. The residue was purified bycolumn chromatography (SiO₂, petroleum ether/ethyl acetate=100/1 to40/1) to give(S)—N-(1-(3-bromo-2-methylphenyl)ethylidene)-2-methylpropane-2-sulfinamide(110 g, 348 mmol, 84.2% yield) as yellow oil.

¹H NMR (400 MHz, CD₃OD) δ=7.63 (br t, J=6.8 Hz, 2H), 7.28 (br d, J=7.6Hz, 1H), 7.17 (t, J=8.0 Hz, 2H), 7.14-7.02 (m, 1H), 2.67 (s, 3H), 2.50(br d, J=4.8 Hz, 3H), 2.42 (s, 3H), 2.31 (br d, J=17.2 Hz, 3H),1.31-1.26 (m, 9H), 1.24-1.16 (m, 9H)

Step D: To a solution of(S)—N-(1-(3-bromo-2-methylphenyl)ethylidene)-2-methylpropane-2-sulfinamide(109 g, 345 mmol, 1.00 eq.) in THF (1100 mL) was added L-selectride (1.0M, 689 mL, 2.00 eq.) at −78° C. The mixture was stirred at −78° C. for 2hours then poured into a saturated aqueous solution of ammonium chloride(1000 mL) and stirred for 60 minutes at 25° C. The aqueous phase wasextracted with ethyl acetate (1000 mL×3). The combined organic phasewere washed with brine (500 mL×3), dried over anhydrous sodium sulfate,filtered, and concentrated under vacuum to give a residue. The residuewas purified by column chromatography (SiO₂, petroleum ether/ethylacetate=100/1 to 2/1) to give a residue. The residue was further washedwith petroleum ether to give(S)—N—((R)-1-(3-bromo-2-methylphenyl)ethyl)-2-methylpropane-2-sulfinamide(70.0 g, 220 mmol, 63.8% yield) as a white solid. LCMS [M+1]⁺: 318.1.

Step E: To a solution of(R)—N—((R)-1-(3-bromo-2-methylphenyl)ethyl)-2-methylpropane-2-sulfinamide(71.0 g, 223 mmol, 1.00 eq.) in an HCl/dioxane solution (300 mL) andMeOH (300 mL) was stirred at 0° C. for 30 minutes. The mixture wasconcentrated in vacuo to give a(R)-1-(3-bromo-2-methylphenyl)ethan-1-amine (55.0 g, crude, HCl) as awhite solid. LCMS [M+1]⁺: 214.1.

Step F: To a solution of (R)-1-(3-bromo-2-methylphenyl)ethan-1-amine(55.0 g, 220 mmol, 1.00 eq., HCl) and Boc₂O (48.4 g, 222 mmol, 50.9 mL,1.01 eq.) in dichloromethane (500 mL) was addedN,N-diisopropylethylamine (56.7 g, 439 mmol, 76.5 mL, 2.00 eq.). Themixture was stirred between 0-25° C. for 30 minutes, then concentratedunder vacuum to give a residue. The residue was purified by columnchromatography (SiO₂, petroleum ether/ethyl acetate=1/0 to 100/1) togive a residue. The residue was further washed with petroleum ether togive tert-butyl (R)-(1-(3-bromo-2-methylphenyl)ethyl)carbamate (51.0 g,162 mmol, 73.9% yield) as a white solid. LCMS [M−55]⁺: 258.0.

¹H NMR (400 MHz, CD₃OD) δ=7.43 (d, J=8.0 Hz, 1H), 7.32 (d, J=8.0 Hz,1H), 7.10-7.03 (m, 1H), 4.93 (br d, J=6.4 Hz, 2H), 2.45 (s, 3H), 1.41(br s, 9H), 1.33 (d, J=6.8 Hz, 3H).

Step G: To a solution of tert-butyl(R)-(1-(3-bromo-2-methylphenyl)ethyl)carbamate (51.0 g, 162 mmol, 1.00eq.) in DMF (540 mL) was added zinc cyanide (22.9 g, 195 mmol, 12.4 mL,1.20 eq.) and Pd(PPh₃)₄ (18.8 g, 16.2 mmol, 0.10 eq.). The mixture wasstirred at 110° C. for 3 hours, then cooled to 25° C. and poured intowater (500 mL). The aqueous phase was extracted with ethyl acetate (100mL×3). The combined organic phases were washed with brine (1000 mL×3),dried over anhydrous sodium sulfate, filtered, and concentrated undervacuum to give a residue. The residue was purified by columnchromatography (SiO₂, petroleum ether/ethyl acetate=100/1 to 5/1) togive tert-butyl (R)-(1-(3-cyano-2-methylphenyl)ethyl)carbamate (37.0 g,142.1 mmol, 87.6% yield) as a white solid. LCMS [M−55]⁺: 205.0.

¹H NMR (400 MHz, CD₃OD) δ=7.63 (d, J=7.6 Hz, 1H), 7.54 (d, J=7.2 Hz,1H), 7.39-7.30 (m, 1H), 4.93 (br d, J=6.8 Hz, 1H), 2.58 (s, 3H), 1.40(br s, 9H), 1.34 (d, J=7.2 Hz, 3H).

Step H: To a solution of tert-butyl(R)-(1-(3-cyano-2-methylphenyl)ethyl)carbamate (49.0 g, 188 mmol, 1.00eq.) in dichloromethane (400 mL) was added TFA (133 mL). The mixture wasstirred at 0° C. for 30 minutes then poured into saturated sodiumbicarbonate solution (200 mL) and stirred for and additional 30 minutes.The aqueous phase was extracted with ethyl acetate (1000 mL×3). Thecombined organic phases were washed with brine (200 mL×3), dried overanhydrous sodium sulfate, filtered, and concentrated under vacuum togive (R)-3-(1-aminoethyl)-2-methylbenzonitrile (26.0 g, 162 mmol, 86.2%yield) as yellow oil. LCMS [M−16]⁺: 144.1.

¹H NMR (400 MHz, DMSO-d₆) δ=8.36 (br s, 2H), 7.86 (d, J=8.0 Hz, 1H),7.80 (dd, J=0.8, 7.6 Hz, 1H), 7.51 (t, J=8.0 Hz, 1H), 4.68 (q, J=6.8 Hz,1H), 2.55 (s, 3H), 1.48 (d, J=6.8 Hz, 3H).

SFC conditions: Column: Chiralpak IC-3 50×4.6 mm I.D., 3 μm Mobilephase: Phase A for CO₂, and Phase B for MeOH (0.05% DEA); Gradientelution: MeOH (0.05% DEA) in CO₂ from 5% to 40% Flow rate: 3 mL/min;Detector: PDA Column Temp: 35° C.; Back Pressure: 100 Bar.

Intermediate P

To a solution of (R)-3-(1-aminoethyl)-2-methylbenzonitrile (16.0 g, 99.9mmol, 1.00 eq.) and 1,7-dichloro-4-methylpyrido[3,4-d]pyridazine (21.4g, 99.9 mmol, 1.00 eq.) in DMSO (130 mL) was added cesium fluoride (22.8g, 150 mmol, 5.52 mL, 1.50 eq.), and the mixture was stirred at 130° C.for 2 hours. The mixture was then cooled to 25° C., diluted with water(200 mL), and extracted with ethyl acetate (200 mL×3). The combinedorganic phases were washed with brine (100 mL×3), dried over anhydroussodium sulfate, filtered, and concentrated under reduced pressure. Theresidue was purified by prep-HPLC [column: Kromasil Eternity XT 250×80mm×10 um; mobile phase: phase A: water (0.1% TFA), phase B:acetonitrile; B %: 25%-55%]. To the combined fractions were combined andthe pH was adjusted to pH=8 using aqueous sodium bicarbonate. Thesuspension was extracted with ethyl acetate (1000 mL×3), and thecombined organic phases were washed with brine (100 mL×3), dried overanhydrous sodium sulfate, filtered, and concentrated under reducedpressure to give(R)-3-(1-((7-chloro-4-methylpyrido[3,4-d]pyridazin-1-yl)amino)ethyl)-2-methylbenzonitrile(14.5 g, 42.9 mmol, 43.0% yield) as a yellow solid.

¹H NMR (400 MHz, CDCl₃) δ=9.19 (d, J=0.4 Hz, 1H), 7.74 (s, 1H), 7.63 (d,J=8.0 Hz, 1H), 7.50 (dd, J=1.2, 7.6 Hz, 1H), 7.23 (t, J=7.6 Hz, 1H),5.72 (quin, J=6.8 Hz, 1H), 5.40 (br d, J=6.0 Hz, 1H), 2.86 (s, 3H), 2.69(s, 3H), 1.63 (s, 3H).

Intermediate Q

To a solution of (R)-3-(1-aminoethyl)-2-methylbenzonitrile (5.32 g, 19.4mmol, 1.00 eq., TFA) and 6-bromo-4-chloro-1-methylphthalazine (5.00 g,19.4 mmol, 1.00 eq.) in DMSO (30.0 mL) was added cesium fluoride (5.90g, 38.8 mmol, 1.43 mL, 2.00 eq.) and N,N-diisopropylethylamine (5.02 g,38.8 mmol, 6.76 mL, 2.00 eq.) and the mixture was stirred at 130° C. for2 hours. The mixture was then cooled to 25° C., diluted with water (10.0mL), and the aqueous phase was extracted with ethyl acetate (100 mL×3).The combined organic phases were washed with brine (100 mL×3), driedover anhydrous sodium sulfate, filtered, and concentrated under reducedpressure. The residue was purified by column chromatography (SiO₂,petroleum ether/ethyl acetate=20/1 to 2/1) to give(R)-3-(1-((7-bromo-4-methylphthalazin-1-yl)amino)ethyl)-2-methylbenzonitrile(5.20 g, 13.6 mmol, 70.2% yield) as a yellow solid. LCMS [M+1]⁺: 381.1.

Intermediate R

Step A: A mixture of (R)-2-methylpropane-2-sulfinamide (5.12 g, 42.2mmol, 1.00 eq.), l-(3-bromo-2-methylphenyl)ethan-1-one (9.00 g, 42.2mmol, 1.00 eq.), titanium (IV) isopropoxide (60.0 g, 211 mmol, 62.3 mL,5.00 eq.) in THF (90.0 mL) was degassed and purged with nitrogen 3times, and stirred at 80° C. for 12 hours. The mixture was cooled to 25°C., quenched by addition of water (100 mL), filtered, and the filtratewas partitioned between ethyl acetate (300 mL) and water (300 mL). Theorganic phase was dried over sodium sulfate, filtered, and concentratedunder reduced pressure to give a residue. The residue was purified bycolumn chromatography (SiO₂, petroleum ether/ethyl acetate=1/0 to 5/1)(R)—N-(1-(3-bromo-2-methylphenyl)ethylidene)-2-methylpropane-2-sulfinamide(7.23 g, 22.8 mmol, 54.1% yield) as a yellow solid. LCMS [M+3]⁺: 318.0.

¹H NMR (400 MHz, CD₃OD) δ=7.67-7.58 (m, 2H), 7.28 (br d, J=7.6 Hz, 1H),7.17 (t, J=8.0 Hz, 2H), 7.14-7.01 (m, 1H), 2.67 (s, 3H), 2.50 (br d,J=4.0 Hz, 3H), 2.42 (s, 3H), 2.31 (br d, J=17.2 Hz, 3H), 1.28 (s, 9H),1.21 (br d, J=11.2 Hz, 9H). (the ratio of E/Z isomers was ˜1/1).

Step B: To a solution of(R)—N-(1-(3-bromo-2-methylphenyl)ethylidene)-2-methylpropane-2-sulfinamide(400 mg, 1.26 mmol, 1.00 eq.) in THF (5.00 mL) was added sodiumborohydride (239 mg, 6.32 mmol, 5.00 eq.) at 0° C. portionwise, then thereaction was stirred at 25° C. for 1 hour. The reaction mixture waspoured into water (30.0 mL) and stirred for 5 minutes. The resultingaqueous phase was extracted with ethyl acetate (150 mL×3), and thecombined organic phases were washed with brine (150 mL×3), dried overanhydrous sodium sulfate, filtered, and concentrated under reducedpressure. The residue was purified by column chromatography (SiO₂,petroleum ether/ethyl acetate=10/l to 1/1) to give(R)—N—((R)-1-(3-bromo-2-methylphenyl)ethyl)-2-methylpropane-2-sulfinamide(200 mg, 628 μmol, 49.7% yield) as a brown oil.

Step C: To a mixture of(R)—N—((R)-1-(3-bromo-2-methylphenyl)ethyl)-2-methylpropane-2-sulfinamide(250 mg, 786 μmol, 1.00 eq), sodium methanesulfinate (176 mg, 1.73 mmol,2.20 eq.), potassium carbonate (326 mg, 2.36 mmol, 3.00 eq.) andL-proline (18.1 mg, 157 μmol, 0.20 eq.) in dimethyl sulfoxide (3.00 mL)was added copper (I) iodide (15.0 mg, 78.6 μmol, 0.10 eq.) at 20° C.,the mixture was stirred at 130° C. for 3 hours under a nitrogenatmosphere. To the mixture was added water (15.0 mL), and the mixturewas extracted with ethyl acetate (20.0 mL×3). The combined organicphases were washed with brine (30.0 mL×3), dried over anhydrous sodiumsulfate, filtered, and concentrated under reduced pressure to give aresidue. The residue was purified by prep-TLC (silica gel plate,petroleum ether/ethyl acetate=1/1) to give(R)-2-methyl-N—((R)-1-(2-methyl-3-(methylsulfonyl)phenyl)ethyl)propane-2-sulfinamide(120 mg, 378 μmol, 48.1% yield) as a yellow oil. LCMS [M+1]⁺: 318.1.

¹H NMR (400 MHz, DMSO-d₆) δ=7.85 (dd, J=8.0, 1.2 Hz, 1H), 7.78 (d, J=7.6Hz, 1H), 7.46 (t, J=8.0 Hz, 1H), 5.42-5.50 (m, 1H), 4.71-4.80 (m, 1H),3.22 (s, 3H), 2.65 (s, 3H), 1.46 (d, J=6.8 Hz, 3H), 1.09 (s, 9H).

Step D: A mixture of(R)-2-methyl-N—((R)-1-(2-methyl-3-(methylsulfonyl)phenyl)ethyl)propane-2-sulfinamide(120 mg, 378 μmol, 1.00 eq.) in hydrochloric acid (4.0 M in dioxane,2.00 mL, 21.2 eq.) was stirred at 20° C. for 1 hour. The mixture wasconcentrated under reduced pressure to give(R)-1-(2-methyl-3-(methylsulfonyl)phenyl)ethan-1-amine (91.0 mg, crude,HCl) as a white solid.

Intermediate S

Step A: To a solution of methyl amine (100 g, 1.48 mol, 3.01 eq. HClsalt) in THF (1.00 L) was added N, N-diisopropylethylamine (237 g, 1.84mol, 3.73 eq.), 2-bromo-6-fluorobenzaldehyde (100 g, 493 mmol, 1.00eq.), acetic acid (9.00 g, 150 mmol, 0.30 eq.) and sodiumcyanoborohydride (62.0 g, 987 mmol, 2.00 eq.). The reaction mixture wasstirred at 25° C. for 3 hours, then diluted with water (500 mL) andextracted with ethyl acetate (1.00 L×2). The combined organic phaseswere washed with brine (500 mL), dried over sodium sulfate, filtered,and concentrated under vacuum to give1-(2-bromo-6-fluorophenyl)-N-methylmethanamine (120 g, 484 mmol, 88%purity) as off white solid which was used in the next step directly.LCMS [M+1]⁺: 218.0.

Step B: To a solution of 1-(2-bromo-6-fluorophenyl)-N-methylmethanamine(120 g, 484 mmol, 88% purity, 1.00 eq.) in THF (1.00 L) was addeddi-tert-butyl dicarbonate (211 g, 968 mmol, 2.00 eq.), and the mixturewas stirred at 25° C. for 2 hours. The mixture was then concentrated invacuo to give a residue. The residue was purified by columnchromatography (SiO₂, petroleum ether/ethyl acetate=1/0 to 100/1) togive tert-butyl A-[(2-bromo-6-fluoro-phenyl)methyl]-N-methyl-carbamate(70.0 g, 220 mmol) as a brown oil. LCMS [M−55]+: 261.9

¹H NMR (400 MHz, DMSO-d6) δ=7.49 (d, J=7.6 Hz, 1H), 7.33-7.26 (m, 2H),4.57 (s, 2H), 2.64 (s, 3H), 1.38 (s, 9H).

Step C: To a solution of tert-butyl(2-bromo-6-fluorobenzyl)(methyl)carbamate (60.0 g, 189 mmol, 1.00 eq.)and 4,4,4′,4′,5,5,5′,5′-octamethyl-2,2′-bi(1,3,2-dioxaborolane) (60.0 g,236 mmol, 1.25 eq.) in dioxane (600 mL) was added Pd(dppf)Cl₂—CH₂Cl₂(15.0 g, 18.4 mmol, 0.10 eq.) and potassium acetate (72.0 g, 734 mmol,3.89 eq.). The reaction mixture was degassed with nitrogen (3 times) andstirred at 100° C. for 12 hours under a nitrogen atmosphere. The mixturewas cooled to 25° C. and concentrated under vacuum to give a residue.The residue was purified by column chromatography (SiO₂, petroleumether/ethyl acetate=1/0 to 100/1) to give tert-butyl(2-fluoro-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzyl)(methyl)carbamate(80.0 g, 160 mmol, 73% purity) as a yellow oil. LCMS [M−55]⁺: 266.1.

Step D: To a solution of tert-butyl(2-fluoro-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzyl)(methyl)carbamate(80.0 g, 160 mmol, 73% purity, 1.00 eq.) and(R)—N-[(1R)-1-(5-bromo-2-thienyl)ethyl]-2-methyl-propane-2-sulfinamide(56.0 g, 180 mmol, 1.13 eq.) in dioxane (500 mL) and water (100 mL) wasadded cesium carbonate (150 g, 460 mmol, 2.88 eq.) and Pd(PPh₃)₄ (20.0g, 17.3 mmol, 0.10 eq.) under a nitrogen atmosphere and the mixture wasstirred at 100° C. for 3 hours under a nitrogen atmosphere. The mixturewas diluted with water (500 mL), extracted with ethyl acetate (1.00L×2), the organic phase was washed with brine (200 mL), dried oversodium sulfate, filtered and concentrated in vacuo to give a residue.The residue was purified by column chromatography (SiO₂, petroleumether/ethyl acetate=0/1 to 5/1) to give tert-butyl(2-(5-((R)-1-(((R)-tert-butylsulfinyl)amino)ethyl)thiophen-2-yl)-6-fluorobenzyl)(methyl)carbamate(84.0 g, 152 mmol, 85% purity) as a yellow oil. LCMS [M−100]⁺: 369.1.

¹H NMR (400 MHz, DMSO-d₆) δ=7.44-7.36 (m, 1H), 7.27-7.17 (m, 2H), 7.08(br d, J=2.8 Hz, 1H), 6.96 (d, J=3.6 Hz, 1H), 5.88 (br d, J=6.8 Hz, 1H),4.65 (quin, J=6.4 Hz, 1H), 4.56 (s, 2H), 2.48 (s, 3H), 1.55 (br d, J=6.8Hz, 3H), 1.33 (br s, 9H), 1.13 (s, 9H).

Step E: To a solution of tert-butyl(2-(5-((R)-1-(((R)-tert-butylsulfinyl)amino)ethyl)thiophen-2-yl)-6-fluorobenzyl)(methyl)carbamate(80.0 g, 145 mmol, 85% purity, 1.00 eq.) in THF (240 mL) and water (48.0mL) was added iodine (6.80 g, 26.8 mmol, 0.19 eq.). The reaction washeated 50° C. for 2 hours, then diluted with water (500 mL) andextracted with ethyl acetate (500 mL×2). The organic phases were washedwith brine (200 mL), dried over sodium sulfate, filtered andconcentrated in vacuo to give a residue. The residue was purified bycolumn chromatography (SiO₂, dichloromethane/methanol=300/1 to 10/1) togive tert-butyl(R)-(2-(5-(1-aminoethyl)thiophen-2-yl)-6-fluorobenzyl)(methyl)carbamate(40.0 g, 110 mmol) as yellow oil. LCMS [M−16]⁺: 348.1.

Intermediate T

Step A: To a mixture of 1-(benzyloxy)-3-bromo-5-(trifluoromethyl)benzene(3.00 g, 9.06 mmol, 1.00 eq.) and Pd(dppf)Cl2 (663 mg, 906 μmol, 0.10eq.) in dioxane (50.0 mL) was added tributyl(1-ethoxyvinyl)tin (5.00 g,13.8 mmol, 4.67 mL, 1.53 eq.) at 20° C., and the mixture was stirred at80° C. for 12 hours under a nitrogen atmosphere. To this mixture wasthen added saturated potassium fluoride solution (100 mL) and thesolution was stirred at 20° C. for 1 hour. The mixture was extractedwith ethyl acetate (100 mL×3), and the combined organic phases werewashed with brine (100 mL×3), dried over anhydrous sodium sulfate,filtered, and concentrated under reduced pressure to give a crude1-(benzyloxy)-3-(1-ethoxyvinyl)-5-(trifluoromethyl)benzene (2.90 g,crude) as a yellow oil. This crude oil was used in the next step withoutfurther purification.

Step B: To a solution of1-(benzyloxy)-3-(1-ethoxyvinyl)-5-(trifluoromethyl)benzene (2.90 g, 9.00mmol, crude, 1.00 eq.) in tetrahydrofuran (30.0 mL) was addedhydrochloric acid (3.0 M in THF, 10.0 mL, 3.33 eq.), and the solutionwas stirred at 20° C. for 1 hour. The mixture was then diluted withwater (60.0 mL), extracted with ethyl acetate (20.0 mL×3), dried overanhydrous sodium sulfate, filtered, and concentrated under reducedpressure. The residue was purified by column chromatography (silica gel,petroleum ether/ethyl acetate=50/1 to 10/1) to give1-(3-(benzyloxy)-5-(trifluoromethyl)phenyl)ethan-1-one (2.60 g, 8.84mmol, 98.2% yield) as a yellow oil.

¹H NMR (400 MHz, CDCl₃) δ=7.79 (s, 1H), 7.74 (s, 1H), 7.45-7.39 (m, 6H),5.16 (s, 2H), 2.63 (s, 3H).

Step C: To a solution of1-(3-(benzyloxy)-5-(trifluoromethyl)phenyl)ethan-1-one (2.60 g, 8.84mmol, 1.00 eq.) and (R)-2-methylpropane-2-sulfinamide (1.39 g, 11.5mmol, 1.30 eq.) in tetrahydrofuran (40.0 mL) was added titanium (IV)ethoxide (5.02 g, 17.7 mmol, 5.22 mL, 2.00 eq.) under a nitrogenatmosphere, and the solution was stirred at 70° C. for 12 hours. Themixture was then concentrated under reduced pressure, and the residuewas purified by column chromatography (silica gel, petroleum ether/ethylacetate=20/1 to 10/1) to give(R)—N-(1-(3-(benzyloxy)-5-(trifluoromethyl)phenyl)ethylidene)-2-methylpropane-2-sulfinamide(2.20 g, 5.03 mmol, 57.0% yield) as a yellow oil.

¹H NMR (400 MHz, CDCl3) δ=7.45 (d, J=10.0 Hz, 2H), 7.24-7.13 (m, 6H),4.94 (s, 2H), 2.56 (s, 3H), 1.10 (s, 9H).

Step D: To a mixture of(R)—N-(1-(3-(benzyloxy)-5-(trifluoromethyl)phenyl)ethylidene)-2-methylpropane-2-sulfinamide(2.20 g, 5.54 mmol, 1.00 eq.) in tetrahydrofuran (30.0 mL) was addedsodium borohydride (270 mg, 7.14 mmol, 1.29 eq.) at 0° C., and themixture was stirred at 20° C. for 3 hours. To the mixture was addedsaturated aqueous ammonium chloride solution (80.0 mL) and the resultingmixture was stirred at 20° C. for 30 minutes. The mixture was thenextracted with ethyl acetate (80.0 mL×3), and the combined organicphases were washed with brine (80.0 mL×3), dried over anhydrous sodiumsulfate, filtered, and concentrated under reduced pressure. The residuewas purified by column chromatography on silica gel (petroleumether/ethyl acetate=50/1 to 3/1) to give (R)—N—((R)1-(3-(benzyloxy)-5-(trifluoromethyl)phenyl)ethyl)-2-methylpropane-2-sulfinamide(1.20 g, 3.00 mmol, 54.3% yield) as a yellow oil.

¹H NMR (400 MHz, CDCl₃) δ=7.53-7.32 (m, 5H), 7.23-7.12 (m, 3H), 5.12 (s,2H), 4.62-4.53 (m, 1H), 3.43 (d, J=2.8 Hz, 1H), 1.53 (d, J=6.4 Hz, 3H),1.25 (s, 9H).

Step E: To a solution of(R)—N—((R)-1-(3-(benzyloxy)-5-(trifluoromethyl)phenyl)ethyl)-2-methylpropane-2-sulfinamide(1.20 g, 3.00 mmol, 1.00 eq.) was added hydrochloric acid (4.0 M indioxane, 751 μL, 1.00 eq.), and the solution was stirred at 20° C. for20 minutes. The mixture was concentrated under reduced pressure toremove to give(R)-1-(3-(benzyloxy)-5-(trifluoromethyl)phenyl)ethan-1-amine (1.20 g,crude, HCl) as a white solid, which was used without furtherpurification.

¹H NMR (400 MHz, CDCl₃) δ=8.82 (s, 2H), 7.44-7.31 (m, 8H), 5.09 (s, 2H),4.42 (s, 1H), 1.43 (s, 3H).

Intermediate U

Step A: To a solution of 3-acetyl-5-fluorobenzonitrile (2.00 g, 12.3mmol, 1.00 eq.) in tetrahydrofuran (20.0 mL) was added titanium ethoxide(5.59 g, 24.5 mmol, 5.08 mL, 2.00 eq.) and(R)-2-methylpropane-2-sulfinamide (1.93 g, 15.9 mmol, 1.30 eq.). Themixture was degassed and purged with nitrogen 3 times, then t stirred at70° C. for 12 hours under a nitrogen atmosphere. The mixture was dilutedwith water (20.0 mL) and filtered. The filtrate was extracted with ethylacetate (30.0 mL×3), dried over anhydrous sodium sulfate, filtered, andconcentrated under reduced pressure to give a residue. The residue waspurified by column chromatography (SiO₂, petroleum ether/ethylacetate=50/1 to 1/1) to give(R,E)-N-(1-(3-cyano-5-fluorophenyl)ethylidene)-2-methylpropane-2-sulfinamide(1.01 g, 3.68 mmol, 30.0% yield, 97.5% purity) as a yellow oil. LCMS[M+1]⁺: 267.1.

¹H NMR (400 MHz, CDCl₃) δ=7.93 (s, 1H), 7.82-7.79 (m, 1H), 7.45-7.52 (m,1H), 2.79 (s, 3H), 1.35 (s, 9H).

Step B: To a solution of(R,E)-N-(1-(3-cyano-5-fluorophenyl)ethylidene)-2-methylpropane-2-sulfinamide(900 mg, 3.38 mmol, 1.00 eq.) in tetrahydrofuran (10.0 mL) was addedsodium borohydride (383 mg, 10.1 mmol, 3.00 eq.) at 0° C. Then themixture was warmed to 20° C. and stirred for 2 hours. The mixture wasquenched with saturated ammonium chloride aqueous solution (20.0 mL) at25° C., extracted with ethyl acetate (20.0 mL×3), dried over anhydroussodium sulfate, filtered, and concentrated under reduced pressure togive a residue. The residue was purified by column chromatography (SiO₂,petroleum ether/ethyl acetate=20/1 to 0/1) to give(R)—N—((R)-1-(3-cyano-5-fluorophenyl)ethyl)-2-methylpropane-2-sulfinamide(711 mg, 2.52 mmol, 74.5% yield, 95.3% purity) as a yellow oil. LCMS[M+1]⁺: 269.1.

¹H NMR (400 MHz, CDCl₃) δ=7.46 (t, J=1.2 Hz, 1H), 7.46-7.33 (m, 1H),7.31-7.29 (m, 1H), 4.60-4.55 (m, 1H), 3.47 (d, J=3.6 Hz, 1H), 1.54 (d,J=6.8 Hz, 3H), 1.25 (s, 9H).

Step C: To a solution of(R)—N—((R)-1-(3-cyano-5-fluorophenyl)ethyl)-2-methylpropane-2-sulfinamide(711 mg, 2.65 mmol, 1.00 eq.) in dioxane (3.00 mL) was addedhydrochloric acid in ethyl acetate (4.0 M, 9.94 mL, 15.0 eq.). Themixture was stirred at 20° C. for 2 hours. The mixture was neutralizedwith saturated sodium bicarbonate solution (10.0 mL), extracted withethyl acetate (10.0 mL×3), dried over anhydrous sodium sulfate,filtered, and concentrated under reduced pressure to give(R)-3-(1-aminoethyl)-5-fluorobenzonitrile (330 mg, crude) as a yellowoil.

¹H NMR (400 MHz, CD₃OD) δ=7.72-7.71 (m, 1H), 7.67-7.66 (m, 1H),7.65-7.62 (m, 1H), 4.59 (q, J=6.8 Hz, 1H), 1.65 (d, J=6.8 Hz, 3H).

Intermediate V

Step A: 1-bromo-2-methyl-3-(trifluoromethyl)benzene (10.0 g, 41.8 mmol,1.00 eq.) was added the ice-cooled concentrated sulfuric acid (100 mL),then potassium nitrate (12.7 g, 125 mmol, 3.00 eq.) was added slowly at0° C., then the mixture was stirred at 100° C. for 1 hour. The mixturewas then cooled to 25° C., poured into ice-water (500 mL), and extractedwith ethyl acetate (300 mL×3). The combined organic layers were washedwith brine (400 mL), dried over sodium sulfate, filtered, andconcentrated under reduced pressure to give a residue. The residue waspurified by column chromatography (SiO₂, petroleum ether/ethylacetate=1/0 to 1/1) to give1-bromo-2-methyl-5-nitro-3-(trifluoromethyl)benzene (5.20 g, 16.9 mmol,40.4% yield) as a white oil.

¹H NMR (400 MHz, DMSO-d₆) δ=8.72 (d, J=2.0 Hz, 1H), 8.40 (d, J=2.4 Hz,1H), 2.58-2.62 (m, 3H).

Step B: A mixture of 1-bromo-2-methyl-5-nitro-3-(trifluoromethyl)benzene(5.20 g, 18.3 mmol, 1.00 eq.) tributyl(1-ethoxyvinyl)tin (8.60 g, 23.8mmol, 8.03 mL, 1.30 eq.) and Pd(PPh₃)₂Cl₂ (385 mg, 549 μmol, 0.03 eq.)in dioxane (60.0 mL) was degassed and purged with nitrogen for 3 times,and then the mixture was stirred at 80° C. for 10 hours under a nitrogenatmosphere. The reaction mixture was quenched with saturated potassiumfluoride solution (300 mL) and stirred at 25° C. for 2 hours. Then thesuspension extracted with ethyl acetate (180 mL×3). The combined organiclayers were washed with brine (200 mL×3), dried over sodium sulfate,filtered, and concentrated under reduced pressure to give1-(1-ethoxyvinyl)-2-methyl-5-nitro-3-(trifluoromethyl)benzene (6.00 g,crude) as black oil.

¹H NMR (400 MHz, CD₃OD) δ=8.47 (d, J=2.0 Hz, 1H), 8.32 (d, J=2.0 Hz,1H), 4.58 (d, J=2.8 Hz, 1H), 4.32 (d, J=2.4 Hz, 1H), 4.00-3.95 (m, 2H),2.56 (d, J=1.2 Hz, 3H), 1.37 (t, J=7.0 Hz, 3H).

Step C: A mixture of1-(1-ethoxyvinyl)-2-methyl-5-nitro-3-(trifluoromethyl)benzene (6.00 g,21.8 mmol, 1.00 eq) and hydrochloric acid (3.0 M, 20.7 mL, 2.85 eq.) inTHF (80.0 mL) was stirred at 20° C. for 1 hour under a nitrogenatmosphere. The reaction mixture was quenched by addition water (100mL), and then extracted with ethyl acetate (60.0 mL×3). The combinedorganic layers were washed with brine (70.0 mL), dried over sodiumsulfate, filtered, and concentrated under reduced pressure to give aresidue. The residue was purified by column chromatography (SiO₂,petroleum ether/ethyl acetate=1/0 to 10/1) to give1-(2-methyl-5-nitro-3-(trifluoromethyl)phenyl)ethan-1-one (4.10 g, 16.5mmol, 76.0% yield) as yellow oil.

¹H NMR (400 MHz, CD₃OD) δ=8.67 (s, 1H), 8.57 (s, 1H), 2.66 (s, 3H), 2.60(s, 3H).

Step D: To a solution of1-(2-methyl-5-nitro-3-(trifluoromethyl)phenyl)ethan-1-one (2.00 g, 8.09mmol, 1.00 eq.) and (R)-2-methylpropane-2-sulfinamide (1.27 g, 10.5mmol, 1.30 eq.) in THF (20.0 mL) was added Ti(OEt)₄ (3.69 g, 16.1 mmol,3.36 mL, 2.00 eq.), the mixture was stirred at 70° C. for 12 hours undera nitrogen atmosphere. The reaction mixture was diluted with water (70.0mL) and ethyl acetate (60.0 mL), filtered, and the filtrate wasextracted with ethyl acetate (50.0 mL×3). The combined organic layerswere dried over sodium sulfate, filtered, and concentrated under reducedpressure to give a residue. The residue was purified by columnchromatography (SiO₂, petroleum ether/ethyl acetate=1/0 to 5/1) to give(RJ)-2-methyl-N-(1-(2-methyl-5-nitro-3-(trifluoromethyl)phenyl)ethylidene)propane-2-sulfinamide(2.00 g, 5.71 mmol, 70.5% yield) as yellow oil.

¹H NMR (400 MHz, CD₃OD) δ=8.43 (s, 1H), 8.30 (s, 1H), 2.75 (s, 3H), 2.58(s, 3H), 1.30 (m, 9H).

Step E: To a solution of(R,E)-2-methyl-N-(1-(2-methyl-5-nitro-3-(trifluoromethyl)phenyl)ethylidene)propane-2-sulfinamide(2.00 g, 5.71 mmol, 1.00 eq) in THF (23.0 mL) was added sodiumborohydride (647 mg, 17.1 mmol, 3.00 eq) at 0° C. The mixture was thenstirred at 20° C. for 2 hours, and saturated sodium bicarbonate wasadded, then diluted with water (100 mL). The mixture was extracted withethyl acetate (60.0 mL×3), the combined organic layers were dried oversodium sulfate, filtered, and concentrated under reduced pressure togive a residue. The residue was purified by column chromatography (SiO₂,petroleum ether/ethyl acetate=1/0 to 0/1) to give(R)-2-methyl-N—((R)-1-(2-methyl-5-nitro-3-(trifluoromethyl)phenyl)ethyl)propane-2-sulfinamide(700 mg, 1.75 mmol, 30.6% yield) as black brown oil. LCMS [M+1]⁺: 353.0.

¹H NMR (400 MHz, DMSO-d₆) δ=8.67 (d, J=2.4 Hz, 1H), 8.31 (d, J=2.0 Hz,1H), 6.09 (d, J=7.2 Hz, 1H), 4.83-4.79 (m, 1H), 2.54 (s, 3H), 1.43 (d,J=6.8 Hz, 1H), 1.11 (m, 9H).

Step F: A mixture of(R)-2-methyl-N—((R)-1-(2-methyl-5-nitro-3-(trifluoromethyl)phenyl)ethyl)propane-2-sulfinamide(700 mg, 1.99 mmol, 1.00 eq) and iodine (151 mg, 595 μmol, 120 μL, 0.30eq) in tetrahydrofuran (8.00 mL) and water (2.00 mL) was degassed andpurged with nitrogen 3 times, and then the mixture was stirred at 50° C.for 2 hour under nitrogen atmosphere. The reaction was quenchedsaturated sodium bicarbonate (50.0 mL) and then extracted with ethylacetate (30.0 mL×3). The combined organic phases were washed with brine(20.0 mL), dried over anhydrous sodium sulfate, filtered, andconcentrated under reduced pressure to give a residue. The residue waspurified by column chromatography (SiO₂, petroleum ether/ethylacetate=10/1 to 0/1) to give(R)-1-(2-methyl-5-nitro-3-(trifluoromethyl)phenyl)ethan-1-amine (250 mg,1.01 mmol, 50.7% yield) as a yellow solid.

¹H NMR (400 MHz, DMSO-d₆) δ=8.76 (d, J=2.4 Hz, 1H), 8.30 (d, J=2.4 Hz,1H), 4.54-4.49 (m, 1H), 2.57 (s, 3H), 1.46 (d, J=6.4 Hz, 1H).

Intermediate W

Step A: To a solution of 1-(3-chloro-2-methylphenyl)ethan-1-one (1.50 g,8.90 mmol, 1.00 eq) in tetrahydrofuran (30.0 mL) was added titaniumethoxide (6.09 g, 26.7 mmol, 5.53 mL, 3.00 eq) and(R)-2-methylpropane-2-sulfinamide (1.40 g, 11.6 mmol, 1.30 eq). Themixture was stirred at 70° C. for 10 hours. The reaction mixture wasquenched by sodium bicarbonate (50.0 mL) at 20° C., and then stirred for10 minutes. The solid was filtered, and the filtrate was extracted withethyl acetate (20.0 mL×3). The combined organic layers were washed withbrine, dried over anhydrous sodium sulfate, filtered, and concentratedunder reduced pressure to give (R,E)-N-(1-(3-chloro-2-methylphenyl)ethylidene)-2-methyl propane-2-sulfinamide (2.40 g, crude) as ayellow oil. LCMS [M+1]⁺: 272.0.

Step B: To a solution of (RJ)-N-(1-(3-chloro-2-methylphenyl)ethylidene)-2-methylpropane-2-sulfinamide (2.30 g, 8.46 mmol,1.00 eq) in tetrahydrofuran (30.0 mL) was added sodium borohydride (850mg, 22.5 mmol, 2.66 eq) at −40° C., the mixture was stirred at −40° C.for 2 hours. The reaction mixture was quenched with saturated ammoniumchloride solution (50.0 mL) at 20° C., and then stirred for 10 mins. Thesolid was filtered off, the filtration was extracted with ethyl acetate(20.0 mL×3). The combined organic layers were washed with brine, driedover anhydrous sodium sulfate, filtered, and concentrated under reducedpressure to give a residue. The residue was purified by columnchromatography (SiO₂, petroleum ether/ethyl acetate=1/0 to 1/1) to give(R)—N—((R)-1-(3-chloro-2-methylphenyl)ethyl)-2-methylpropane-2-sulfinamide (1.50 g, 5.48 mmol, 64.7%yield) as a colourless oil. LCMS [M+1]⁺: 274.1.

Step C: To a solution of (R)—N—((R)-1-(3-chloro-2-methylphenyl)ethyl)-2-methylpropane-2-sulfinamide (1.10 g, 4.02 mmol, 1.00 eq)in ethyl acetate (20.0 mL) was added hydrochloride in ethyl acetate (4.0M, 30.0 mL) at 0° C., the mixture was stirred at 20° C. for 2 hours. Thereaction mixture was concentrated under reduced pressure to give(R)-1-(3-chloro-2-methylphenyl)ethan-1-amine (700 mg, crude) as a whitesolid. LCMS [M+1]⁺: 170.1.

Intermediate X

Step A: To a solution of1-(3-methyl-5-(trifluoromethyl)phenyl)ethan-1-one (500 mg, 2.47 mmol,1.00 eq.) and (R)-2-methylpropane-2-sulfinamide (689 mg, 5.69 mmol, 2.30eq.) in THF (7.00 mL) was added Ti(OEt)₄ (1.30 g, 5.69 mmol, 1.18 mL,2.30 eq.), the mixture was stirred at 70° C. for 12 hours under anitrogen atmosphere. The reaction mixture was diluted with water (30.0mL) and ethyl acetate (20.0 mL), filtered and the filtrate was extractedwith ethyl acetate (3×20.0 mL). The combined organic layers were driedover sodium sulfate, filtered, and concentrated under reduced pressureto give a residue. The residue was purified by column chromatography(SiO₂, petroleum ether/ethyl acetate=10/1) to give(R,E)-2-methyl-N-(1-(3-methyl-5-(trifluoromethyl)phenyl)ethylidene)propane-2-sulfinamide(750 mg, 2.46 mmol, 99.3% yield) as a yellow oil. LCMS [M+1]⁺: 306.1.

¹H NMR (400 MHz, DMSO-d₆) δ=7.99 (s, 1H), 7.95 (s, 1H), 7.75 (s, 1H),5.75 (s, 1H), 2.76 (s, 3H), 2.46 (s, 3H), 1.22 (s, 9H).

Step B: To a solution of(R,E)-2-methyl-N-(1-(3-methyl-5-(trifluoromethyl)phenyl)ethylidene)propane-2-sulfinamide(650 mg, 2.13 mmol, 1.00 eq.) in THF (15.0 mL) was added sodiumborohydride (253 mg, 6.69 mmol, 3.14 eq.) at −40° C. The mixture wasstirred at −40° C. for 2 hours. The mixture was added saturated sodiumbicarbonate solution and diluted by water (50.0 mL). The mixture wasextracted with ethyl acetate (3×50.0 mL), the combined organic layerswere dried over sodium sulfate, filtered, and concentrated under reducedpressure to give a residue. The residue was purified by columnchromatography (SiO₂, petroleum ether/ethyl acetate=5/1 to 2/1) to give(R)-2-methyl-N—((R)-1-(3-methyl-5-(trifluoromethyl)phenyl)ethyl)propane-2-sulfinamide(320 mg, 1.04 mmol, 48.9% yield) as a light yellow solid. LCMS [M+1]⁺:308.1.

¹H NMR (400 MHz, CD₃OD) δ=7.52 (s, 1H), 7.50 (s, 1H), 7.39 (s, 1H),4.56-4.51 (m, 1H), 2.44 (s, 1H), 1.54-1.53 (d, 3H), 1.25 (s, 9H).

Step C: A solution of(R)-2-methyl-N—((R)-1-(3-methyl-5-(trifluoromethyl)phenyl)ethyl)propane-2-sulfinamide(305 mg, 992 μmol, 1.00 eq.) in hydrochloric acid (4.0 M in ethylacetate, 10.0 mL), resulting mixture was stirred at 25° C. for 1 hr.Concentrated under reduced pressure to give(R)-1-(3-methyl-5-(trifluoromethyl)phenyl)ethan-1-amine (200 mg, crude)as a light yellow solid. The crude was used directly into next stepwithout further purification. LCMS [M+1]⁺: 204.0.

Intermediate Y

Step A: To a solution of1-(4-amino-6-(trifluoromethyl)pyridin-2-yl)ethan-1-one (35.6 g, 175mmol, 1.00 eq.) and (R)-2-methylpropane-2-sulfinamide (25.4 g, 209 mmol,1.20 eq.) in THF (350 mL) was added titanium (IV) isopropoxide (149 g,524 mmol, 155 mL, 3.00 eq.), and 1,2-dimethoxyethane (15.7 g, 175 mmol,18.1 mL, 1.00 eq.). The reaction mixture was stirred at 80° C. for 12hours, after which point was added water (50.0 mL) to give a suspension.The suspension was filtered, the filtrate was concentrated under reducedpressure to give a residue, the residue was purified by silica gelchromatography(petroleum ether/ethyl acetate=10/1 to 1/1) to give(R)—N-(1-(4-amino-6-(trifluoromethyl)pyridin-2-yl)ethylidene)-2-methylpropane-2-sulfinamide(44.0 g, 143 mmol, 82.0% yield) as brown oil.

¹H NMR (400 MHz, CDCl₃) δ=7.45 (d, J=2.0 Hz, 1H), 6.97 (d, J=2.0 Hz,1H), 4.56 (br s, 2H), 2.82 (s, 3H), 1.33 (s, 9H).

Step B: To a solution of(R)—N-(1-(4-amino-6-(trifluoromethyl)pyridin-2-yl)ethylidene)-2-methylpropane-2-sulfinamide(44.0 g, 143 mmol, 1.00 eq.) in THF (400 mL) was added sodiumborohydride (16.3 g, 430 mmol, 3.00 eq.) at 0° C. in portionwise, thenthe reaction was stirred at 0° C. for 1 hour. The mixture was slowlypoured into water (200 mL) and stirred for 5 minutes, then extractedwith ethyl acetate (300 mL×3). The combined organic phases were washedwith brine (200 mL×3), dried with anhydrous sodium sulfate, filtered andconcentrated under reduced pressure to give a residue. The residue waspurified by column chromatography (SiO₂, petroleum ether/ethylacetate=10/l to 1/1) to give(R)—N—((R)-1-(4-amino-6-(trifluoromethyl)pyridin-2-yl)ethyl)-2-methylpropane-2-sulfinamide(24.0 g, 76.2 mmol, 53.2% yield, 98.2% purity) as a brown oil.

¹H NMR (400 MHz, CDCl₃) δ=6.63 (d, J=2.0 Hz, 1H), 6.56 (d, J=2.0 Hz,1H), 5.06 (d, J=6.0 Hz, 1H), 4.69 (s, 2H), 4.46-4.39 (m, 1H), 1.45 (d,J=6.8 Hz, 3H), 1.27 (s, 9H).

Step C: To a solution of(R)—N—((R)-1-(4-amino-6-(trifluoromethyl)pyridin-2-yl)ethyl)-2-methylpropane-2-sulfinamide(23.5 g, 76.0 mmol, 1.00 eq) in HCl/dioxane (200 mL) was stirred at 25°C. for 2 hours. The mixture was filtered, and the filter cake was washedwith ethyl acetate (100 mL), then the filter cake was collected anddried under vacuum to give(R)-2-(1-aminoethyl)-6-(trifluoromethyl)pyridin-4-amine (hydrochloridesalt) as a white solid.

¹H NMR (400 MHz, DMSO-d₆) δ=8.43 (br s, 3H), 6.93 (br d, J=2.0 Hz, 2H),6.74 (d, J=1.6 Hz, 1H), 4.34-4.27 (m, 1H), 1.45 (d, J=6.8 Hz, 3H).

Intermediate Z

Step A: To a solution of 1-(2-methylpyridin-3-yl)ethan-1-one (800 mg,5.92 mmol, 1.00 eq.) and (S)-2-methylpropane-2-sulfinamide (933 mg, 7.69mmol, 1.30 eq.) in tetrahydrofuran (8.00 mL) was added titanium (IV)ethoxide (2.70 g, 11.8 mmol, 2.45 mL, 2.00 eq.) and 1,2-dimethoxyethane(533 mg, 5.92 mmol, 615 μL, 1.00 eq.), and the mixture was stirred at70° C. for 16 hours. After cooling to 25° C. the mixture wasconcentrated under reduced pressure and purified by columnchromatography (SiO₂, petroleum ether/ethyl acetate=5/1 to 1/1) to give(S)-2-methyl-N-(1-(2-methylpyridin-3-yl)ethylidene)propane-2-sulfinamide(1.25 g, 5.24 mmol, 88.6% yield) as a yellow oil. LCMS [M+1]⁺: 239.2.

Step B: To a solution of(S)-2-methyl-N-(1-(2-methylpyridin-3-yl)ethylidene)propane-2-sulfinamide(1.25 g, 5.24 mmol, 1.00 eq.) in tetrahydrofuran (7.00 mL) was addeddropwise L-selectride (1.0 M in THF, 7.87 mL, 1.50 eq.) at −78° C. over30 minutes, then stirred for an additional 1 hour at −78° C. Thereaction mixture was then quenched by addition saturated ammoniumchloride solution (in water, 30.0 mL) at 0° C., and stirred for another1 hour at 25° C. The solution was then extracted with ethyl acetate(50.0 mL×3), and the combined organic layers were washed with brine(30.0 mL×2), dried over anhydrous sodium sulfate, filtered, andconcentrated under reduced pressure. The residue was purified twice bycolumn chromatography (SiO₂, petroleum ether/ethyl acetate=5/1 to 0/1)to give(S)-2-methyl-N—((R)-1-(2-methylpyridin-3-yl)ethyl)propane-2-sulfinamide(600 mg, 2.50 mmol, 47.6% yield) as a white solid. LCMS [M+1]⁺: 432.3.

¹H NMR (400 MHz, CDCl₃) δ=8.36 (dd, J=1.2, 3.6 Hz, 1H), 7.64 (dd, J=1.6,8.0 Hz, 1H), 7.12 (dd, J=4.8, 7.6 Hz, 1H), 4.81-4.70 (m, 1H), 2.58 (s,3H), 1.47 (d, J=6.8 Hz, 3H), 1.14 (s, 9H).

SFC conditions: Column: Chiralpak AD-3 50×4.6 mm I.D., 3 um Mobilephase: Phase A: CO₂, and Phase B: for MeOH (0.05% diethylamine);Gradient elution: MeOH (0.05% diethylamine) in C02 from 5% to 40% f Flowrate: 3 mL/min; Detector: PDA Column Temp: 35° C.; Back Pressure: 100Bar.

Step C: A mixture of (S)-2-methyl-N—((R)-1-(2-methyl pyridin-3-yl)ethyl)propane-2-sulfinamide (600 mg, 2.50 mmol, 1.00 eq.) inHCl.dioxane (3.00 mL) was was stirred at 0° C. for 30 minutes under anitrogen atmosphere. After this time, a white precipitate was formed,and the suspension was filtered. The cake was collected and dried undervacuum, and the residue was further purified by prep-HPLC [column:Waters Xbridge 150×25 mm×5 um; mobile phase: phase A: water (0.05%ammonium hydroxide v/v), phase B: MeCN; B %: 3%-33%] to give(R)-1-(2-methylpyridin-3-yl)ethan-1-amine (370 mg, 2.23 mmol, 89.2%yield, 82% purity) as an colorless oil. LCMS [M−16]⁺: 120.3.

Intermediate AA

Step A: To a solution of 1-bromo-3-(difluoromethyl)-2-fluorobenzene(commercially available, 4.50 g, 20.0 mmol, 1.00 eq.) in 1,4-dioxane(50.0 mL) was added PdCl₂(PPh₃)₂ (1.40 g, 2.00 mmol, 0.10 eq.) andtributyl(1-ethoxyvinyl)tin (21.7 g, 60.0 mmol, 20.3 mL, 3.00 eq.), andthe mixture was degassed and purged with nitrogen (3 times) then stirredat 100° C. for 3 hours under a nitrogen atmosphere. The mixture wascooled to room temperature, concentrated under reduced pressure, andadded potassium fluoride aqueous solution (2.0 M, 100 mL) was added tothe residue. The mixture was extracted with ethyl acetate (100 mL×3),dried over anhydrous sodium sulfate, and filtered. The filtrate wasconcentrated under reduced pressure to give1-(difluoromethyl)-3-(1-ethoxyvinyl)-2-fluorobenzene (7.50 g, crude) asa brown oil, which was used without further purification.

Step B: To a solution of1-(difluoromethyl)-3-(1-ethoxyvinyl)-2-fluorobenzene (7.50 g, 34.7 mmol,1.00 eq.) in tetrahydrofuran (50.0 mL) was added hydrochloric aqueoussolution (30.0 mL, 10% purity), and the mixture was stirred at 25° C.for 1 hour. After this time, the pH of the mixture was adjusted to ˜pHto 6-8 with sodium bicarbonate aqueous solution and the mixture wasextracted with ethyl acetate (100 mL×3). The combined organic layerswere dried over anhydrous sodium sulfate, filtered, and concentratedunder reduced pressure. The residue was purified by columnchromatography (silica gel, petroleum ether/ethyl acetate=1/0 to 5/1) togive 1-(3-(difluoromethyl)-2-fluorophenyl)ethan-1-one (6.01 g, 31.3mmol, 90.2% yield, 98.0% purity) as a colorless oil. LCMS [M+1]⁺: 189.1.

¹H NMR (400 MHz, CDCl₃) δ=8.02-7.97 (m, 1H), 7.80-7.76 (m, 1H), 7.34 (t,J=8.0 Hz, 1H), 6.94 (t, J=14.8 Hz, 1H), 2.66 (d, J=5.2 Hz, 3H).

Step C: A mixture of (S)-2-methylpropane-2-sulfinamide (2.32 g, 19.1mmol, 1.20 eq.), l-(3-(difluoromethyl)-2-fluorophenyl)ethan-1-one (3.00g, 16.0 mmol, 1.00 eq.) and titanium (IV) ethoxide(7.27 g, 31.9 mmol,6.60 mL, 2.00 eq.) in 2-methyl tetrahydrofuran (30.0 mL) was degassedand purged with nitrogen (3 times), and then stirred at 75° C. for 4hours under a nitrogen atmosphere. The reaction mixture was then cooled,diluted with water (50.0 mL), extracted with ethyl acetate (50.0 mL×3),and the combined organic layers were washed with brine (100 mL×2), driedover anhydrous sodium sulfate, and filtered. The filtrate wasconcentrated under reduced pressure, and the residue was purified bycolumn chromatography (silica gel, petroleum ether/ethyl acetate=20/1 to1/1) to give(S)—N-(1-(3-(difluoromethyl)-2-fluorophenyl)ethylidene)-2-methylpropane-2-sulfinamide(1.80 g, 6.18 mmol, 38.8% yield). LCMS [M+1]⁺: 292.2.

Step D: To a mixture of(R)—N-(1-(3-(difluoromethyl)-2-fluorophenyl)ethylidene)-2-methylpropane-2-sulfinamide(1.80 g, 6.18 mmol, 1.00 eq.) in 2-methyl tetrahydrofuran (30.0 mL) wasadded L-selectride (3.52 g, 18.5 mmol, 4.10 mL, 3.00 eq.) under anitrogen atmosphere at −78° C., and then the mixture was stirred at −78°C. for 3 hours under a nitrogen atmosphere. After this time, additionalL-selectride (1.76 g, 9.30 mmol, 2.00 mL, 1.50 eq.) was added and thesolution was degassed and purged with nitrogen (3 times) and stirred at−78° C. for 9 hours under a nitrogen atmosphere. The mixture was cooledto room temperature, diluted with water (30.0 mL), and extracted withethyl acetate (30.0 mL×3). The combined organic layers were washed withbrine (30.0 mL×2), dried over anhydrous sodium sulfate, filtered, andconcentrated under reduced pressure. The residue was purified by columnchromatography (silica gel, petroleum ether/ethyl acetate=20/1 to 1/1)to give(S)—N—((R)-1-(3-(difluoromethyl)-2-fluorophenyl)ethyl)-2-methylpropane-2-sulfinamide(1.30 g, 4.34 mmol, 70.3% yield, 98% purity) as a colorless oil. LCMS[M+1]⁺: 294.2.

Step E: To a solution of(S)—N—((R)-1-(3-(difluoromethyl)-2-fluorophenyl)ethyl)-2-methylpropane-2-sulfinamide(1.29 g, 4.43 mmol, 1.00 eq.) was added hydrochloric acid (4.00 M in1,4-dioxane, 15.0 mL, 14.0 eq.), and the mixture was stirred at 25° C.for 30 minutes. The mixture was then diluted with water (30.0 mL),extracted with ethyl acetate (30.0 mL %), and the combined organiclayers were washed with brine (30.0 mL×2), dried over anhydrous sodiumsulfate, and filtered. The filtrate was concentrated under reducedpressure to (R)-1-(3-(difluoromethyl)-2-fluorophenyl)ethan-1-amine (480mg, 2.13 mmol, 48.0% yield, HCl salt) as a yellow oil, which was usedwithout further purification.

¹H NMR (400 MHz, CDCl₃) δ=7.52-7.47 (m, 2H), 7.24-7.19 (m, 1H), 6.88 (t,J=14.8 Hz, 1H), 4.85-4.92 (m, 1H), 1.57 (d, J=6.8 Hz, 3H).

Step F: A mixture of(R)-1-(3-(difluoromethyl)-2-fluorophenyl)ethan-1-amine (300 mg, 1.59mmol, 1.00 eq.), 1,7-dichloro-4-methylpyrido[3,4-d]pyridazine (339 mg,1.59 mmol, 1.00 eq.) and potassium fluoride (461 mg, 7.93 mmol, 186 μL,5.00 eq.) in dimethyl sulfoxide (6.00 mL) was degassed and purged withnitrogen (3 times), and the mixture was stirred at 130° C. for 12 hoursunder a nitrogen atmosphere. The mixture was then cooled to 25° C.,diluted with water (30.0 mL), and extracted with ethyl acetate (30.0mL×3). The combined organic layers were washed with brine (30.0 mL×3),dried over sodium sulfate, filtered, and concentrated under reducedpressure. The residue was purified by column chromatography (silica gel,petroleum ether/ethyl acetate=10/1 to 1/1) and prep-HPLC [column:Phenomenex luna C18 150×25 mm×10 um; mobile phase: phase A: water(0.225%formic acid), phase B: acetonitrile; B %: 20%-50%] to give(R)-7-chloro-N-(1-(3-(difluoromethyl)-2-fluorophenyl)ethyl)-4-methylpyrido[3,4-d]pyridazin-1-amine(250 mg, 629 μmol, 39.7% yield, 92.3% purity) as a yellow solid. LCMS[M+1]⁺: 367.2.

Intermediate AB

Step A: To a solution of 3-bromo-5-fluoro-2-methylbenzoic acid (4.00 g,17.2 mmol, 1.00 eq.) and N,O-dimethylhydroxylamine (1.84 g, 18.9 mmol,1.10 eq., HCl salt) in DMF (50.0 mL) was added N,N-diisopropylethylamine(6.66 g, 51.5 mmol, 8.97 mL, 3.00 eq.) and HATU (7.83 g, 20.6 mmol, 1.20eq.), and the reaction mixture was stirred at 20° C. for 2 hours. Thereaction mixture was diluted with ethyl acetate (50.0 mL), washed withbrine (30.0 mL×3), and the combined organic phases were collected, driedover sodium sulfate, filtered, and concentrated under reduced pressure.The residue was purified by column chromatography (SiO₂, petroleumether/ethyl acetate=5/1 to 2/1) to give3-bromo-5-fluoro-N-methoxy-N,2-dimethylbenzamide (4.70 g, 17.0 mmol,99.2% yield) as a white solid.

Step B: To a solution of 3-bromo-5-fluoro-N-methoxy-N,2-dimethyl-benzamide (4.70 g, 17.0 mmol, 1.00 eq.) in THF (100 mL) wasadded methylmagnesium bromide (3.0 M, 34.1 mL, 6.00 eq.) dropwise at 0°C. After dropwise addition was completed, the reaction mixture waswarmed to 45° C. and stirred for 5 hours. The mixture was then cooled to25° C., quenched by water (20.0 mL), and extracted with ethyl acetate(50.0 mL×3). The combined organic phases were dried over sodium sulfate,filtered, and concentrated under reduced pressure. The residue waspurified by column chromatography (SiO₂, petroleum ether/ethylacetate=5/1) to give 1-(3-bromo-5-fluoro-2-methylphenyl)ethan-1-one(3.80 g, 16.5 mmol, 96.6% yield) as a light yellow solid.

¹H NMR (400 MHz, CDCl₃) δ=7.43 (dd, J=2.8, 7.6 Hz, 1H), 7.19 (dd, J=2.8,8.4 Hz, 1H), 2.55 (s, 3H), 2.45 (d, J=0.4 Hz, 3H).

Step C: To a solution of 1-(3-bromo-5-fluoro-2-methylphenyl)ethan-1-one(3.80 g, 16.5 mmol, 1.00 eq.) and (5)-2-methylpropane-2-sulfinamide(2.79 g, 23.0 mmol, 1.40 eq.) in THF (60.0 mL) was added titanium (IV)ethoxide (7.50 g, 32.9 mmol, 6.82 mL, 2.00 eq.) and 1,2-dimethoxyethane(1.48 g, 16.5 mmol, 1.71 mL, 1.00 eq.), and the mixture was stirred at70° C. for 12 hours. The reaction mixture was then cooled to 25° C.,diluted with ethyl acetate (100 mL) and water (10.0 mL) to give asuspension. The suspension was filtered, and the filtrate wasconcentrated under reduced pressure to remove all volatiles. The residuewas purified by column chromatography (SiO₂, petroleum ether/ethylacetate=30/1 to 20/1) to give(R)—N-(1-(3-bromo-5-fluoro-2-methylphenyl)ethylidene)-2-methylpropane-2-sulfinamide(4.70 g, 14.1 mmol, 85.5% yield) as yellow oil. LCMS [M+3]⁺: 336.0.

¹H NMR (400 MHz, CDCl₃) δ=7.35 (br dd, J=2.4, 7.6 Hz, 1H), 6.92 (dd,J=2.4, 8.4 Hz, 1H), 2.66 (s, 3H), 2.37 (s, 3H), 1.30 (s, 9H).

Step D: To a solution of (S)—N-(1-(3-bromo-5-fluoro-2-methylphenyl)ethylidene)-2-methylpropane-2-sulfinamide (5.50 g, 16.5 mmol,1.00 eq.) in THF (80.0 mL) was added L-selectride (1.0 M, 24.7 mL, 1.50eq.) dropwise at −78° C., and the reaction mixture was warmed to 0° C.and stirred for 2 hours. The mixture was then diluted with ammoniumchloride aqueous solution (30.0 mL), and the resulting solution wasextracted with ethyl acetate (50.0 mL×2). The combined organic phaseswere dried over sodium sulfate, filtered, and concentrated under reducedpressure. The residue was triturated with petroleum ether (20.0 mL),filtered, and the filter cake was dried under vacuum to give(S)—N—((R)-1-(3-bromo-5-fluoro-2-methylphenyl)ethyl)-2-methylpropane-2-sulfinamide(3.20 g, 9.52 mmol, 57.8% yield) as a white solid.

¹H NMR (400 MHz, CDCl₃) δ=7.24 (dd, J=2.4, 7.6 Hz, 1H), 7.10 (dd, J=2.8,10.0 Hz, 1H), 4.90-4.82 (m, 1H), 3.30 (br d, J=2.8 Hz, 1H), 2.42 (s,3H), 1.48 (d, J=6.8 Hz, 3H), 1.23 (s, 9H).

Step E: To a solution of(S)—N—((R)-1-(3-bromo-5-fluoro-2-methylphenyl)ethyl)-2-methylpropane-2-sulfinamide(1.60 g, 4.76 mmol, 1.00 eq.) in THF (20.0 mL) and water (5.00 mL) wasadded iodine (362 mg, 1.43 mmol, 288 μL, 0.30 eq.), and the mixture wasstirred at 50° C. for 2 hours. The mixture was then cooled to 25° C.,and the pH was adjusted to pH=7 with sodium bicarbonate aqueoussolution. The resulting solution was extracted with DCM (20.0 mL×3), andthe combined organic phases were dried over sodium sulfate, filtered,and concentrated under reduced pressure to give(R)-1-(3-bromo-5-fluoro-2-methylphenyl)ethan-1-amine (1.20 g, crude) asa light yellow oil. This crude oil was used without furtherpurification.

Step F: To a solution of(R)-1-(3-bromo-5-fluoro-2-methylphenyl)ethan-1-amine (1.20 g, 5.17 mmol,1.00 eq.) in THF (20.0 mL) was added di-tert-butyl dicarbonate (1.35 g,6.20 mmol, 1.43 mL, 1.20 eq.) and the mixture was stirred at 20° C. for3 hours. The mixture was then concentrated under reduced pressure, andthe residue was purified by column chromatography (SiO₂, petroleumether/ethyl acetate=150/1 to 70/1) to give tert-butyl(R)-(1-(3-bromo-5-fluoro-2-methylphenyl)ethyl)carbamate (1.45 g, 4.36mmol, 84.4% yield) as a white solid.

Step G: A mixture of tert-butyl(R)-(1-(3-bromo-5-fluoro-2-methylphenyl)ethyl)carbamate (1.35 g, 4.06mmol, 1.00 eq.), zinc cyanide (954 mg, 8.13 mmol, 516 μL, 2.00 eq.),DPPF (451 mg, 813 μmol, 0.20 eq.), zinc powder (26.6 mg, 406 μmol, 0.10eq.) and Pd₂(dba)₃ (372 mg, 406 μmol, 0.10 eq.) in dimethylacetamide(20.0 mL) was degassed and purged with nitrogen (3 times), and themixture was stirred at 120° C. for 6 hours under a nitrogen atmosphere.The mixture was then diluted with ethyl acetate (60.0 mL), filtered, andthe filtrate was washed with brine (30.0 mL×3), dried over sodiumsulfate, and concentrated under reduced pressure. The residue waspurified by column chromatography (SiO₂, petroleum ether/ethylacetate=100/l to 30/1) to give tert-butyl(R)-(1-(3-cyano-5-fluoro-2-methylphenyl)ethyl)carbamate (1.10 g, 3.95mmol, 97.3% yield) as a light yellow solid.

Step H: To a solution of tert-butyl(R)-(1-(3-cyano-5-fluoro-2-methylphenyl)ethyl)carbamate (1.10 g, 3.95mmol, 1.00 eq.) in DCM (5.00 mL) was added TFA (1.88 g, 16.5 mmol, 1.22mL, 4.18 eq.) and the mixture was stirred at 20° C. for 1 hour. Themixture was then concentrated under reduced pressure, and the residuewas adjusted to pH=7 with saturated sodium bicarbonate aqueous solution.The resulting solution was extracted with DCM (50.0 mL), and the organicphase was dried over sodium sulfate, and concentrated in vacuum to give(R)-3-(1-aminoethyl)-5-fluoro-2-methylbenzonitrile (0.80 g, crude) asbrown oil which was used without further purification.

Intermediate AC

Step A: To a solution of 2-bromo-4-fluoro-6-(trifluoromethyl)aniline(2.00 g, 7.75 mmol, 1.00 eq.) and tributyl(1-ethoxyvinyl)tin (2.80 g,7.75 mmol, 2.62 mL, 1.00 eq.) in dioxane (20.0 mL) was addedPdCl₂(PPh₃)₂ (544 mg, 775 μmol, 0.10 eq.) under a nitrogen atmosphere,and the mixture was stirred at 80° C. for 12 hours. The reaction mixturewas then cooled to 25° C., diluted with potassium fluoride aqueoussolution (100 mL) and then extracted with ethyl acetate (100 mL×3). Thecombined organic layers were washed with brine (100 mL), dried oversodium sulfate, filtered, and concentrated under reduced pressure togive compound 2-(1-ethoxyvinyl)-4-fluoro-6-(trifluoromethyl)aniline(4.00 g, crude) as a yellow oil. To a solution of2-(1-ethoxyvinyl)-4-fluoro-6-(trifluoromethyl)aniline (4.00 g, crude) intetrahydrofuran (50.0 mL) was added hydrochloric acid aqueous solution(4.00 M, 20.0 mL, 1.33 eq.) dropwise. Then the mixture was stirred at25° C. for 1 hour, diluted with water (100 mL) and extracted with ethylacetate (300 mL×3). The combined organic layers were washed with brine(200 mL), dried over sodium sulfate, filtered, and concentrated underreduced pressure. The residue was purified by column chromatography(petroleum ether/ethyl acetate=30/1 to 3/1) to give compound1-(2-amino-5-fluoro-3-(trifluoromethyl)phenyl)ethan-1-one (5.60 g, 25.3mmol, 42.0% yield, 99.9% purity) as a yellow solid.

¹H NMR (400 MHz, DMSO-d₆) δ=7.99 (d, J=9.2 Hz, 1H), 7.65-7.61 (m, 1H),7.33 (s, 2H), 2.59 (s, 3H).

Step B: To a solution of1-(2-amino-5-fluoro-3-(trifluoromethyl)phenyl)ethan-1-one (5.60 g, 25.3mmol, 1.00 eq.) in hydrochloric acid (50.0 mL) and water (100 mL) wasadded sodium nitrite (2.27 g, 32.9 mmol, 1.30 eq.) portionwise, thenpotassium iodide (8.41 g, 50.6 mmol, 2.00 eq.) was added to the mixtureat 0° C. After the addition was finished, the reaction mixture wasstirred at 25° C. for 12 hours then diluted with water (100 mL), andextracted with ethyl acetate (200 mL×3). The combined organic layerswere washed with sodium sulfite (200 mL×3), dried over sodium sulfate,filtered, and concentrated under reduced pressure. The residue waspurified by column chromatography (petroleum ether/ethyl acetate=50/1 to10/1) to give compound1-(5-fluoro-2-iodo-3-(trifluoromethyl)phenyl)ethan-1-one (5.60 g, 10.3mmol, 40.8% yield, 61.2% purity) as a yellow solid.

¹H NMR (400 MHz, DMSO-d₆) δ=7.83-7.76 (m, 1H), 7.74-7.71 (m, 1H), 2.56(s, 3H).

Step C: To a solution of methylboronic acid (1.62 g, 27.1 mmol, 2.50eq.) and 1-(5-fluoro-2-iodo-3-(trifluoromethyl)phenyl)ethan-1-one (3.60g, 10.8 mmol, 1.00 eq.) in dioxane (20.0 mL) was added Pd(dppf)Cl₂ (400mg, 542 μmol, 0.05 eq.) and potassium carbonate (7.49 g, 54.2 mmol, 5.00eq.) under a nitrogen atmosphere, and the mixture was stirred at 90° C.for 12 hours. The mixture was then cooled to 25° C., diluted with water(50.0 mL) and extracted with ethyl acetate (100 mL×3). The combinedorganic layers were washed with brine (100 mL), dried over sodiumsulfate, filtered, and concentrated under reduced pressure. The residuewas purified by column chromatography (petroleum ether/ethylacetate=50/1 to 10/1) to give compound1-(5-fluoro-2-methyl-3-(trifluoromethyl)phenyl)ethan-1-one (1.70 g, 7.72mmol, 71.2% yield) as a yellow oil.

¹H NMR (400 MHz, CDCl₃) δ=7.47 (dd, J=2.8, 8.8 Hz, 1H), 7.36-7.30 (m,1H), 2.58 (s, 3H), 2.47 (s, 3H).

Step D: To a solution of1-(5-fluoro-2-methyl-3-(trifluoromethyl)phenyl)ethan-1-one (2.20 g, 9.99mmol, 1.00 eq.) and (R)-2-methylpropane-2-sulfinamide (2.42 g, 20.0mmol, 2.00 eq.) in tetrahydrofuran (15.0 mL) was added titanium (IV)isopropoxide (5.68 g, 20.0 mmol, 5.90 mL, 2.00 eq.) and1-methoxy-2-(2-methoxyethoxy)ethane (4.12 g, 30.7 mmol, 4.40 mL, 3.08eq), and the mixture was stirred at 75° C. for 12 hours. The mixture wasthen cooled to 25° C., diluted with water (50.0 mL) to give asuspension. The resulting suspension was filtered, and the filtrate wasdiluted with ethyl acetate (100 mL×3). The combined organic layers werewashed with brine (50.0 mL), dried over sodium sulfate, filtered, andconcentrated under reduced pressure. The residue was purified by columnchromatography (petroleum ether/ethyl acetate=10/1 to 3/1) to givecompound(R)—N-(1-(5-fluoro-2-methyl-3-(trifluoromethyl)phenyl)ethylidene)-2-methylpropane-2-sulfinamide(1.50 g, 4.64 mmol, 46.4% yield) as a yellow oil.

¹H NMR (400 MHz, CDCl₃) δ=7.39 (dd, J=2.2, 8.8 Hz, 1H), 7.10 (dd, J=2.4,8.4 Hz, 1H), 2.68 (s, 3H), 2.41 (s, 3H), 1.30 (s, 9H).

Step E: To a solution of(R)—N-(1-(5-fluoro-2-methyl-3-(trifluoromethyl)phenyl)ethylidene)-2-methylpropane-2-sulfinamide(1.90 g, 5.88 mmol, 1.00 eq.) in tetrahydrofuran (20.0 mL) was addedsodium borohydride (667 mg, 17.6 mmol, 3.00 eq.) portionwise at 0° C.The reaction mixture was stirred at 0° C. for 2 hours, then dilutedslowly with saturated aqueous ammonium chloride (50.0 mL) and stirredfor 30 minutes. The resulting mixture was extracted with ethyl acetate(100 mL×3), and the combined organic layers were dried over anhydroussodium sulfate, filtered, and concentrated under reduced pressure. Theresidue was purified by column chromatography (petroleum ether/ethylacetate=10/1 to 3/1) to afford(R)—N—((R)-1-(5-fluoro-2-methyl-3-(trifluoromethyl)phenyl)ethyl)-2-methylpropane-2-sulfinamide(1.30 g, 4.00 mmol, 68.0% yield) as a yellow oil.

¹H NMR (400 MHz, CDCl₃) δ=7.40-7.28 (m, 2H), 4.95-4.84 (m, 1H),3.40-3.32 (m, 1H), 2.43 (s, 3H), 1.49 (d, J=6.4 Hz, 3H), 1.23 (s, 9H).

Step F: To a solution of(R)—N—((R)-1-(5-fluoro-2-methyl-3-(trifluoromethyl)phenyl)ethyl)-2-methylpropane-2-sulfinamide(1.30 g, 4.00 mmol, 1.00 eq.) in dichloromethane (5.00 mL) was addedhydrochloric acid (4.00 M in 1,4-dioxane, 5.00 mL, 5.0 eq.), and themixture was stirred at 25° C. for 1 hour. The mixture was thenconcentrated under reduced pressure to give compound(R)-1-(5-fluoro-2-methyl-3-(trifluoromethyl)phenyl)ethan-1-amine (700mg, 2.81 mmol, 70.4% yield, 88.9% purity, HCl salt) as a yellow oil,which was used directly without further purification.

Intermediate AD

Step A: To a solution of 3-bromo-2,5-difluorobenzaldehyde (4.00 g, 18.1mmol, 1.00 eq.) and (R)-2-methylpropane-2-sulfinamide (3.07 g, 25.3mmol, 1.40 eq.) in THF (50.0 mL) was added titanium (IV) ethoxide (8.26g, 36.2 mmol, 7.51 mL, 2.00 eq.) and 1,2-dimethoxyethane (1.63 g, 18.1mmol, 1.88 mL, 1.00 eq.), and the mixture was stirred at 70° C. for 12hours. The mixture was then cooled to 25° C., diluted with ethyl acetate(50.0 mL) and water (5.00 mL) slowly to give a suspension. Thesuspension was filtered, and the filtrate was concentrated under reducedpressure then purified by column chromatography (SiO₂, petroleumether/ethyl acetate=20/1 to 10/1) to give(S)—N-(3-bromo-2,5-difluorobenzylidene)-2-methylpropane-2-sulfinamide(5.70 g, 17.6 mmol, 97.1% yield) as a white solid.

¹H NMR (400 MHz, CDCl₃) δ=8.81 (d, J=2.4 Hz, 1H), 7.74 (dd, J=6.0, 8.4Hz, 1H), 7.44 (dd, J=5.2, 8.8 Hz, 1H), 1.28 (s, 9H).

Step B: To a solution of(R)—N-(3-bromo-2,5-difluorobenzylidene)-2-methylpropane-2-sulfinamide(5.50 g, 17.0 mmol, 1.00 eq.) in DCM (60.0 mL) was added methylmagnesiumbromide (3.0 M, 17.0 mL, 3.00 eq.) dropwise at −60° C., and then themixture was warmed to 0° C. and stirred for 1 hour. The mixture wasdiluted with ammonium chloride aqueous solution (50.0 mL), and theresulting aqueous solution was extracted with ethyl acetate (50.0 mL×3).The combined organic phases were dried over sodium sulfate, filtered,and concentrated under reduced pressure. The residue was purified bycolumn chromatography (SiO₂, petroleum ether/ethyl acetate=5/1 to 2/1)to give(S)—N—((R)-1-(3-bromo-2,5-difluorophenyl)ethyl)-2-methylpropane-2-sulfinamide(3.50 g, 10.3 mmol, 60.6% yield) as a white solid.

¹H NMR (400 MHz, CDCl₃) δ=7.31-7.26 (m, 1H), 7.16 (dd, J=6.4, 8.8 Hz,1H), 4.89-4.78 (m, 1H), 3.35 (br d, J=4.0 Hz, 1H), 1.56 (d, J=6.8 Hz,3H), 1.23 (s, 9H).

Step C: To a solution of(S)—N—((R)-1-(3-bromo-2,5-difluorophenyl)ethyl)-2-methylpropane-2-sulfinamide(1.50 g, 4.41 mmol, 1.00 eq.) in THF (20.0 mL) and water (5.00 mL) wasadded iodine (336 mg, 1.32 mmol, 266 μL, 0.30 eq.), and the mixture wasstirred at 50° C. for 2 hours. The mixture was then cooled to 25° C.,and the pH was adjusted to pH=7 with sodium bicarbonate aqueoussolution. The resulting aqueous solution was extracted with DCM (20.0mL×3), and the combined organic phases were dried over sodium sulfate,filtered, and concentrated under reduced pressure to give(R)-1-(3-bromo-2,5-difluorophenyl)ethan-1-amine (1.20 g, crude) as alight yellow oil. This crude oil was used directly without furtherpurification.

Step D: To a solution of (R)-1-(3-bromo-2,5-difluorophenyl)ethan-1-amine(1.20 g, 5.08 mmol, 1.00 eq.) in THF (20.0 mL) was added di-tert-butyldicarbonate (1.22 g, 5.59 mmol, 1.28 mL, 1.10 eq.), and the mixture wasstirred at 20° C. for 2 hours. The reaction mixture was concentratedunder reduced pressure, and purified by column chromatography (SiO₂,petroleum ether/ethyl acetate=150/1 to 80/1) to give tert-butyl(R)-(1-(3-bromo-2,5-difluorophenyl)ethyl)carbamate (1.30 g, 3.87 mmol,76.1% yield) as a white solid.

Step E: A mixture of tert-butyl(R)-(1-(3-bromo-2,5-difluorophenyl)ethyl)carbamate (1.20 g, 3.57 mmol,1.00 eq.), zinc cyanide (838 mg, 7.14 mmol, 453 μL, 2.00 eq.), zinc(23.3 mg, 357 μmol, 0.10 eq.), DPPF (396 mg, 714 μmol, 0.20 eq.) andPd₂(dba)₃ (327 mg, 357 μmol, 0.10 eq.) in dimethylacetamide (20.0 mL)was degassed and purged with nitrogen (3 times), and the mixture wasstirred at 115° C. for 3 hours under a nitrogen atmosphere. The mixturewas then cooled 25° C., diluted with ethyl acetate (100 mL), and theorganic phase was washed with brine (50.0 mL×3), dried over sodiumsulfate, filtered, and concentrated under reduced pressure. The residuewas purified by column chromatography (SiO₂, petroleum ether/ethylacetate=100/1 to 30/1) to give tert-butyl(R)-(1-(3-cyano-2,5-difluorophenyl)ethyl)carbamate (0.90 g, 3.19 mmol,89.3% yield) as a light yellow solid.

Step F: To a solution of tert-butyl(R)-(1-(3-cyano-2,5-difluorophenyl)ethyl)carbamate (0.90 g, 3.19 mmol,1.00 eq.) in DCM (10.0 mL) was added TFA (4.62 g, 40.5 mmol, 3.00 mL,12.7 eq.), and the reaction mixture was stirred at 20° C. for 1 hour.The reaction mixture was then concentrated under reduced pressure, andthe residue was diluted with water (10.0 mL). The pH of the solution wasadjusted to pH=7 with sodium bicarbonate aqueous solution, and theresulting aqueous solution was extracted with DCM (20.0 mL×2). Thecombined organic phases were dried over sodium sulfate, filtered, andconcentrated under reduced pressure to give(R)-3-(1-aminoethyl)-2,5-difluorobenzonitrile (700 mg, crude) aslight-yellow oil. This compound was used directly without furtherpurification.

Intermediate AE

Step A: To a solution of 1-bromo-3-fluoro-2-(trifluoromethyl)benzene(39.0 g, 160 mmol, 1.00 eq) in dimethylsulfoxide (200 mL) was added zinccyanide (11.5 g, 176 mmol, 7.56 mL, 1.10 eq), and the reaction mixturewas stirred at 80° C. for 16 hours. The mixture was then cooled to 25°C., diluted with ethyl acetate (1.00 L), and the organic phase phase wasseparated, washed with water (500 mL×3), dried over sodium sulfate,filtered, and concentrated under reduced pressure. The residue waspurified by silica gel chromatography (petroleum ether/ethyl acetate=1/0to 2/1) to give 3-bromo-2-(trifluoromethyl)benzonitrile (29.0 g, 116mmol, 72.3% yield) as a white solid.

¹H NMR (400 MHz, DMSO-d₆) δ=8.20 (d, J=8.0 Hz, 1H), 8.10 (d, J=7.6 Hz,1H), 7.75 (t, J=8.0 Hz, 1H).

Step B: To a solution of 3-bromo-2-(trifluoromethyl)benzonitrile (29.0g, 116 mmol, 1.00 eq) and tributyl(1-ethoxyvinyl)tin (50.3 g, 139 mmol,47.0 mL, 1.20 eq) in toluene (250 mL) was added Pd(PPh₃)₄ (6.70 g, 5.80mmol, 0.05 eq) under a nitrogen atmosphere, and the mixture was stirredat 100° C. for 16 hours. The reaction mixture was cooled to 25° C.,diluted with water (500 mL) and ethyl acetate (200 mL), and finallyfollowed by addition of potassium fluoride (50.0 g) solid. The mixturewas stirred at 25° C. for 30 minutes, then the organic layer wasseparated, dried over sodium sulfate, filtered, and concentrated underreduced pressure. The residue was purified by column chromatography(SiO₂, petroleum ether/ethyl acetate=20/1 to 5/1) to afford a crudeproduct. The crude product was triturated by petroleum ether (50.0 mL),filtered, and the filtrate was concentrated under reduced pressure togive 3-(1-ethoxyvinyl)-2-(trifluoromethyl)benzonitrile (8.00 g, 33.2mmol, 23.0% yield) as light yellow oil.

¹H NMR (400 MHz, CDCl₃) δ=7.82 (d, J=7.2 Hz, 1H), 7.70 (d, J=7.2 Hz,1H), 7.65-7.59 (t, J=7.6 Hz, 1H), 4.37 (d, J=2.8 Hz, 1H), 4.25 (d, J=2.8Hz, 1H), 3.90 (q, J=7.2 Hz, 2H), 1.36 (t, J=6.8 Hz, 3H).

Step C: To a solution of3-(1-ethoxyvinyl)-2-(trifluoromethyl)benzonitrile (7.00 g, 29.0 mmol,1.00 eq.) in tetrahydrofuran (10.0 mL) was added hydrochloric acid (2.00M, 29.0 mL, 2.00 eq.), and the reaction mixture was stirred at 20° C.for 2 hours. The pH of the mixture was then adjusted to pH=8 with sodiumbicarbonate aqueous solution and further diluted with water (100 mL).The resulting solution was extracted with ethyl acetate (50.0 mL×3), andthe combined organic organic phases were washed with brine (100 mL),dried over sodium sulfate, filtered, and concentrated under reducedpressure. The residue was purified by column chromatography (SiO₂,petroleum ether/ethyl acetate=20/1 to 5/1) to give3-acetyl-2-(trifluoromethyl)benzonitrile (5.30 g, 24.8 mmol, 85.6%yield) as colorless oil.

¹H NMR (400 MHz, DMSO-d₆) δ=8.25 (dd, J=0.8, 7.6 Hz, 1H), 8.07-7.94 (m,2H), 2.60 (s, 3H).

Step D: To a solution of 3-acetyl-2-(trifluoromethyl)benzonitrile (1.00g, 4.69 mmol, 1.00 eq.) and (R)-2-methylpropane-2-sulfinamide (625 mg,5.16 mmol, 1.10 eq.) in tetrahydrofuran (2.00 mL) was added1,2-dimethoxyethane (423 mg, 4.69 mmol, 488 μL, 1.00 eq.) and titanium(IV) ethoxide (3.21 g, 14.1 mmol, 2.92 mL, 3.00 eq), and the reactionmixture was stirred at 80° C. for 16 hours. The mixture was concentratedunder reduced pressure, and the residue was diluted with ethyl acetate(100 mL) and poured into a mixture of celatom (20.0 g) and saturatedsodium bicarbonate (10.0 g) in water (100 mL). The mixture was stirredthen filtered, and the filter cake was stirred with ethyl acetate (30.0mL) and filtered, the procedure was repeated three times until the cakeof product was washed away. The combined filtrate was separated, and theaqueous phase was extracted with ethyl acetate (100 mL). The combinedorganic layers were washed with brine (50.0 mL), dried over sodiumsulfate, filtered, and concentrated under reduced pressure. The residuewas purified by flash silica gel chromatography (ethyl acetate/petroleumether, 0-30%) to afford(R)—N-(1-(3-cyano-2-(trifluoromethyl)phenyl)ethylidene)-2-methylpropane-2-sulfinamide(950 mg, 2.99 mmol, 63.7% yield, 99.5% purity) as light yellow oil. LCMS[M+1]⁺: 317.1.

¹H NMR (400 MHz, CDCl₃) δ=7.92-7.80 (m, 1H), 7.77-7.65 (m, 1H),7.61-7.37 (m, 1H), 2.74-2.38 (m, 3H), 1.29-1.24 (m, 9H).

Step E: To a solution of(R)—N-(1-(3-cyano-2-(trifluoromethyl)phenyl)ethylidene)-2-methylpropane-2-sulfinamide(1.70 g, 5.37 mmol, 1.00 eq.) in tetrahydrofuran (20.0 mL) was addedsodium borohydride (610 mg, 16.0 mmol, 3.00 eq.) portionwise under anitrogen atmosphere at 0° C. After addition, the mixture was stirred atthis temperature for 30 minutes, and then warmed to 25° C. and stirredfor an additional 3 hours. The mixture was then diluted with saturatedaqueous ammonium chloride (100 mL) dropwise under a nitrogen atmospherewhile stirring at 25° C., then extracted with ethyl acetate (150 mL×2).The combined organic layers were dried over anhydrous sodium sulfate,filtered, and concentrated under reduced pressure. The residue waspurified by column chromatography (SiO₂, petroleum ether/ethylacetate=5/1 to 1/1) to give(R)—N-(1-(3-cyano-2-(trifluoromethyl)phenyl)ethyl)-2-methylpropane-2-sulfinamide(1.50 g, 4.71 mmol, 87.7% yield, mixture of diastereomers) as a whitesolid. LCMS [M+1]⁺: 319.1.

Step F: A mixture of(R)—N-(1-(3-cyano-2-(trifluoromethyl)phenyl)ethyl)-2-methylpropane-2-sulfinamide(1.4 g, 4.40 mmol, 1.00 eq.) in HCL dioxane (10.0 mL) was was stirred at5° C. for 30 minutes. After this time, a white precipitate was formedand the suspension was filtered. The filter cake was collected and driedunder vacuum to give 3-(1-aminoethyl)-2-(trifluoromethyl)benzonitrile(850 mg, 3.39 mmol, 77.1% yield, HCl salt) as a white solid. LCMS[M+1]⁺: 215.1.

¹H NMR (400 MHz, DMSO-d₆) δ=8.84 (s, 3H), 8.38 (br d, J=8.0 Hz, 1H),8.19 (d, J=7.6 Hz, 1H), 8.12-7.95 (m, 1H), 4.64 (br d, J=6.0 Hz, 1H),1.56 (d, J=6.0 Hz, 3H).

Step G: A mixture of 3-(1-aminoethyl)-2-(trifluoromethyl)benzonitrile(300 mg, 1.40 mmol, 1.00 eq., HCl salt),1,7-dichloro-4-methylpyrido[3,4-d]pyridazine (300 mg, 1.40 mmol, 1.00eq. diisopropylethylamine (499 mg, 3.86 mmol, 673 μL, 2.76 eq.) andcesium fluoride (400 mg, 2.63 mmol, 97.0 μL, 1.88 eq.) indimethylsulfoxide (1.50 mL) was degassed and purged with nitrogen (3times), and then the mixture was stirred at 130° C. for 1 hour under anitrogen atmosphere. The mixture was then cooled to 25° C. and ethylacetate (60.0 mL) was added, and the organic solution was washed withbrine (30.0 mL×2), dried over anhydrous sodium sulfate, filtered andconcentrated under reduced pressure. The residue was purified by columnchromatography (SiO₂, petroleum ether/ethyl acetate=5/1 to 1/1) to give3-(1-((7-chloro-4-methylpyrido[3,4-d]pyridazin-1-yl)amino)ethyl)-2-(trifluoromethyl)benzonitrile(160 mg, 408 μmol, 29.2% yield) as a white solid. LCMS [M+1]⁺: 392.1.

3-(1-((7-chloro-4-methylpyrido[3,4-d]pyridazin-1-yl)amino)ethyl)-2-(trifluoromethyl)benzonitrile(160 mg) was further purified using SFC [column: DAICEL CHIRALPAK AD(250 mm×30 mm, 10 um); mobile phase: phase A: (0.1% NH₄OH) in MeOH,phase B: CO₂; B %: 20%-20%] to give the first eluting isomer as(R)-3-(1-((7-chloro-4-methylpyrido[3,4-b]pyridazin-1-yl)amino)ethyl)-2-(trifluoromethyl)benzonitrile(62.0 mg, 158 μmol, 39.0% yield) as a white solid. LCMS [M+1]⁺: 392.1.

¹H NMR (400 MHz, CD₃OD) δ=9.24 (d, J=0.8 Hz, 1H), 8.46 (d, J=0.8 Hz,1H), 8.05 (d, J=8.4 Hz, 1H), 7.80 (d, J=7.2 Hz, 1H), 7.71-7.57 (m, 1H),5.74 (q, J=6.8 Hz, 1H), 2.74 (s, 3H), 1.68 (d, J=6.8 Hz, 3H).

Intermediate AF

Step A: To a solution of 4-fluoro-3-nitro-5-(trifluoromethyl)benzoicacid (2.00 g, 7.90 mmol, 1.00 eq.) in tetrahydrofuran (15.0 mL) wasadded palladium on carbon (7.90 mmol, 10% purity, 1.00 eq.) under anitrogen atmosphere, and the mixture was stirred at 25° C. for 2 hoursunder a hydrogen atmosphere (15 Psi). The mixture was then filtered andconcentrated under reduced pressure to give compound3-amino-4-fluoro-5-(trifluoromethyl)benzoic acid (1.60 g, 7.17 mmol,90.8% yield) as a white solid.

¹H NMR (400 MHz, DMSO-d₆) δ=7.68-7.64 (m, 1H), 7.32-7.29 (m, 1H),5.95-5.89 (m, 2H).

Step B: To a solution of 3-amino-4-fluoro-5-(trifluoromethyl)benzoicacid (1.50 g, 6.72 mmol, 1.00 eq.) and N,O-dimethylhydroxylamine (830mg, 13.45 mmol, 2.00 eq.) in N,N-dimethylformamide (10.0 mL) was addedHATU (5.11 g, 13.5 mmol, 2.00 eq.) and N,N-diisopropylethylamine (2.61g, 20.2 mmol, 3.50 mL, 3.00 eq.) and the mixture was stirred at 25° C.for 12 hours. The mixture was diluted with water (50.0 mL) and thenextracted with ethyl acetate (50.0 mL×3). The combined organic layerswere washed with brine (50.0 mL×3), dried over sodium sulfate, filteredand concentrated under reduced pressure. The residue was purified bycolumn chromatography (silica gel, petroleum ether/ethyl acetate=10/1 to3/1) to give compound3-amino-4-fluoro-N-methoxy-N-methyl-5-(trifluoromethyl)benzamide (1.50g, 5.64 mmol, 83.9% yield) as a yellow oil.

¹H NMR (400 MHz, CDCl₃) δ=7.38-7.34 (m, 2H), 3.57 (s, 3H), 3.36 (s, 3H)

Step C: To a solution of3-amino-4-fluoro-N-methoxy-N-methyl-5-(trifluoromethyl)benzamide (1.50g, 5.64 mmol, 1.00 eq.) in dichloromethane (10.0 mL) was addeddi-tert-butyl dicarbonate (3.69 g, 16.9 mmol, 3.88 mL, 3.00 eq.) and4-dimethylaminopyridine (688 mg, 5.64 mmol, 1.00 eq.), and the mixturewas stirred at 25° C. for 12 hours. The reaction mixture was dilutedwith water (50.0 mL) and then extracted with ethyl acetate (50.0 mL×3).The combined organic layers were washed with brine (50.0 mL×3), driedover sodium sulfate, filtered, and concentrated under reduced pressure.The residue was purified by column chromatography (silica gel, petroleumether/ethyl acetate=10/1 to 3/1) to give compound tert-butyl(tert-butoxycarbonyl)(2-fluoro-5-(methoxy(methyl)carbamoyl)-3-(trifluoromethyl)phenyl)carbamate(2.00 g, 4.29 mmol, 76.1% yield) as a yellow oil.

¹H NMR (400 MHz, CDCl₃) δ=8.05-8.01 (m, 1H), 7.87-7.84 (m, 1H), 3.55 (s,3H), 3.39 (s, 3H), 1.42 (s, 18H).

Step D: To a solution of tert-butyl(tert-butoxycarbonyl)(2-fluoro-5-(methoxy(methyl)carbamoyl)-3-(trifluoromethyl)phenyl)carbamate(1.80 g, 3.86 mmol, 1.00 eq.) in tetrahydrofuran (20.0 mL) was addedmethylmagnesium bromide solution (3.00 M, 3.86 mL, 3.00 eq.) at 0° C.,and the mixture was stirred at 0° C. for 12 hours. The reaction mixturewas then diluted with water (100 mL), and the solution was extractedwith ethyl acetate (100 mL×3). The combined organic layers were washedwith brine (100 mL×3), dried over sodium sulfate, filtered, andconcentrated under reduced pressure. The residue was purified by columnchromatography (silica gel, petroleum ether/ethyl acetate=10/1 to 3/1)to give compound tert-butyl(5-acetyl-2-fluoro-3-(trifluoromethyl)phenyl)carbamate (1.10 g, 3.42mmol, 88.7% yield) as a yellow oil.

¹H NMR (400 MHz, CDCl₃) δ=8.98 (d, J=6.4 Hz, 1H), 7.90-7.87 (m, 1H),6.86 (s, 1H), 2.65 (s, 3H), 1.56 (s, 9H).

Step E: To a solution of tert-butyl(5-acetyl-2-fluoro-3-(trifluoromethyl)phenyl)carbamate (1.10 g, 2.61mmol, 1.00 eq.) and (R)-2-methylpropane-2-sulfinamide (950 mg, 7.83mmol, 3.00 eq.) in tetrahydrofuran (10.0 mL) were added titanium (IV)isopropoxide (1.48 g, 5.22 mmol, 1.54 mL, 2.00 eq.) and1-methoxy-2-(2-methoxyethoxy)ethane (1.87 g, 13.97 mmol, 2.00 mL, 5.35eq.), and the mixture was stirred at 70° C. for 12 hours. The mixturewas then diluted with water (50.0 mL) and extracted with ethyl acetate(50.0 mL×3). The combined organic layers were washed with brine (50.0mL×3), dried over sodium sulfate, filtered, and concentrated underreduced pressure. The residue was purified by column chromatography(petroleum ether/ethyl acetate=10/1 to 3/1) to give compound tert-butyl(R)-(5-(1-((tert-butylsulfinyl)imino)ethyl)-2-fluoro-3-(trifluoromethyl)phenyl)carbamate(1.00 g, 2.36 mmol, 90.1% yield) as a yellow oil.

¹H NMR (400 MHz, CDCl₃) δ=8.86 (d, J=6.4 Hz, 1H), 7.82 (d, J=6.0 Hz,1H), 6.85 (s, 1H), 2.79 (s, 3H), 1.54 (s, 9H), 1.33 (s, 9H).

Step F: To a solution of tert-butyl(R)-(5-(1-((tert-butylsulfinyl)imino)ethyl)-2-fluoro-3-(trifluoromethyl)phenyl)carbamate(1.00 g, 2.36 mmol, 1.00 eq.) in tetrahydrofuran (10.0 mL) was addedsodium borohydride (268 mg, 7.07 mmol, 3.00 eq.) at 0° C., and themixture was stirred at 0° C. for 2 hours. The mixture was then dilutedwith water (50.0 mL) and extracted with ethyl acetate (50.0 mL×3). Thecombined organic layers were washed with brine (50.0 mL×3), dried oversodium sulfate, filtered, and concentrated under reduced pressure togive a residue. The residue was purified by column chromatography(silica gel, petroleum ether/ethyl acetate=10/1 to 3/1) to give compoundtert-butyl(5-((R)-1-(((R)-tert-butylsulfinyl)amino)ethyl)-2-fluoro-3-(trifluoromethyl)phenyl)carbamate(620 mg, 1.45 mmol, 61.7% yield) as a white solid.

¹H NMR (400 MHz, CDCl₃) δ=8.34 (d, J=6.4 Hz, 1H), 7.23-7.20 (m, 1H),6.80 (s, 1H), 4.56-5.53 (m, 1H), 1.54-1.52 (m, 12H), 1.24 (s, 9H).

Step G: To a solution of tert-butyl(5-((R)-1-(((R)-tert-butylsulfinyl)amino)ethyl)-2-fluoro-3-(trifluoromethyl)phenyl)carbamate(620 mg, 1.45 mmol, 1.00 eq.) in dichloromethane (5.00 mL) was addedhydrochloride (4.00 M in 1,4-dioxane, 5.00 mL, 13.76 eq.), and themixture was stirred at 25° C. for 1 hour. The mixture was thenconcentrated under reduced pressure to give compound(R)-5-(1-aminoethyl)-2-fluoro-3-(trifluoromethyl)aniline (280 mg, 1.24mmol, 85.5% yield, 98.6% purity, HCl salt) as a yellow oil. Thiscompounds was used directly without further purification.

Intermediate AG

Step A: To a solution of methyl 4,6-dichloropicolinate (4.50 g, 21.8mmol, 1.00 eq.) in dichloromethane (40.0 mL) was added DIBAL-H (1.0 M,65.5 mL, 3.00 eq.) dropwise over 10 minutes at −78° C., and the reactionmixture was stirred at −78° C. for 2 hours. The mixture was then dilutedwith water (2.50 mL) dropwise at 0° C. under a nitrogen atmosphere,followed by addition of sodium hydroxide aqueous solution (2.50 mL,w/w=15%) and water (6.26 mL). The mixture was then stirred at 0° C. for30 minutes to give a suspension, and the suspension was filtered and thefiltrate was concentrated under reduced pressure. The residue waspurified by column chromatography (SiO₂, petroleum ether/ethylacetate=30/1 to 10/1) to give (4,6-dichloropyridin-2-yl)methanol (2.40g, 13.5 mmol, 61.7% yield) as a yellow oil.

¹H NMR (400 MHz, DMSO-d₆) δ=7.65 (s, 1H), 7.52 (s, 1H), 5.69 (t, J=6.0Hz, 1H), 4.53 (d, J=6.0 Hz, 2H).

Step B: To a solution of (4,6-dichloropyridin-2-yl)methanol (2.40 g,13.5 mmol, 1.00 eq.) in dichloromethane (20.0 mL) was added Dess-Martinperiodinane (11.4 g, 27.0 mmol, 8.35 mL, 2.00 eq.) portionwise at 0° C.,and the mixture was stirred at 20° C. for 2 hours. The mixture was thenpoured into water (10.0 mL) and stirred for 15 minutes, then saturatedsodium thiosulfate aqueous solution (20.0 mL) was slowly added and themixture was stirred for an additional 15 minutes. The suspension wasfiltered, the layers were separated, and the aqueous phase was extractedwith DCM (20.0 mL×2). The combined organic layers were washed with brine(20 mL), dried over anhydrous sodium sulfate, filtered, and concentratedunder reduced pressure. The residue was purified by columnchromatography (SiO₂, petroleum ether/ethyl acetate=50/1 to 10/1) togive 4,6-dichloropicolinaldehyde (1.60 g, 9.09 mmol, 67.4% yield) as ared oil.

¹H NMR (400 MHz, DMSO-d₆) δ=9.87 (s, 1H), 8.14 (d, J=1.6 Hz, 1H), 8.01(d, J=1.6 Hz, 1H).

Step C: To a solution of 4,6-dichloropicolinaldehyde (1.10 g, 6.25 mmol,1.00 eq.) in dichloromethane (10.0 mL) was added diethylaminosulfurtrifluoride (2.01 g, 12.5 mmol, 1.65 mL, 2.00 eq.) dropwise at −20° C.,and the mixture was stirred at 25° C. for 1 hour. The mixture was thenslowly poured into saturated sodium bicarbonate aqueous solution (10.0mL) at 25° C., and the resulting solution was extracted with ethylacetate (10.0 mL×3). The combined organic phases were washed with brine(5.00 mL×3), dried over anhydrous sodium sulfate, filtered, andconcentrated in under reduced pressure. The residue was purified bycolumn chromatography (SiO₂, petroleum ether/ethyl acetate=100/1 to20/1) to give 2,4-dichloro-6-(difluoromethyl)pyridine (1.00 g, 5.05mmol, 80.8% yield) as yellow oil.

¹H NMR (400 MHz, CD₃OD) δ=7.75 (s, 1H), 7.74 (s, 1H), 6.82-6.55 (m, 1H).

Step D: To a solution of tributyl(1-ethoxyvinyl)tin (2.01 g, 5.56 mmol,1.88 mL, 1.00 eq.) and 2,4-dichloro-6-(difluoromethyl)pyridine (1.10 g,5.56 mmol, 1.00 eq.) in dioxane (10.0 mL) was added Pd(PPh₃)₂Cl₂ (390mg, 556 μmol, 0.10 eq) under a nitrogen atmosphere, and the mixture wasstirred at 110° C. for 12 hours. The reaction mixture was cooled to 25°C. and slowly poured into a saturated potassium fluoride aqueoussolution (20.0 mL). The resulting aqueous solution was extracted withethyl acetate (50.0 mL×3), and the combined organic layers were washedwith brine (30.0 mL×2), dried over anhydrous sodium, filtered, andconcentrated under reduced pressure. The residue was purified by columnchromatography (SiO₂, petroleum ether/ethyl acetate=100/1 to 20/1) togive 4-chloro-2-(difluoromethyl)-6-(1-ethoxyvinyl)pyridine (1.20 g, 5.14mmol, 92.5% yield) as a yellow oil which was used in the next stepdirectly.

To a solution of 4-chloro-2-(difluoromethyl)-6-(1-ethoxyvinyl)pyridine(1.00 g, 4.28 mmol, 1.00 eq) in dioxane (5.00 mL) was added hydrochloricacid aqueous solution (2.00 M, 4.28 mL, 2.00 eq) at 20° C., and themixture was stirred at 20° C. for 1 hour. The pH of the mixture was thenadjusted to pH=8 by addition saturated sodium bicarbonate (15.0 mL), andextracted with ethyl acetate (30.0 mL×2). The combined organic phaseswere washed with brine (10.0 mL×2), dried over anhydrous sodium sulfate,filtered, and concentrated under reduced pressure. The residue waspurified by column chromatography (SiO₂, petroleum ether/ethylacetate=50/1 to 10/1) to give1-(4-chloro-6-(difluoromethyl)pyridin-2-yl)ethan-1-one (800 mg, 3.89mmol, 90.9% yield) as a white solid.

¹H NMR (400 MHz, CD₃OD) δ=8.10-8.16 (m, 1H), 7.95 (d, J=1.6 Hz, 1H),6.67-6.95 (m, 1H), 2.69 (s, 3H).

Step E: To a solution of1-(4-chloro-6-(difluoromethyl)pyridin-2-yl)ethan-1-one (0.85 g, 4.13mmol, 1.00 eq.) and tert-butyl carbamate (1.45 g, 12.4 mmol, 3.00 eq.)in dioxane (6.00 mL) was added cesium carbonate (2.69 g, 8.27 mmol, 2.00eq.), XPhos (394 mg, 827 μmol, 0.20 eq.), and palladium acetate (92.8mg, 413 μmol, 0.10 eq.) under a nitrogen atmosphere, and the mixture wasstirred at 90° C. for 2 hours. The mixture was then cooled to 25° C. andconcentrated under reduced pressure, and the residue was purified bycolumn chromatography (SiO₂, petroleum ether/ethyl acetate=100/1 to10/1) to give tert-butyl(2-acetyl-6-(difluoromethyl)pyridin-4-yl)carbamate (1.00 g, 3.49 mmol,84.5% yield) as a white solid. LCMS [M+1]⁺: 287.1.

Step F: To a solution of tert-butyl(2-acetyl-6-(difluoromethyl)pyridin-4-yl)carbamate (1.00 g, 3.49 mmol,1.00 eq.) and (<S)-2-methylpropane-2-sulfinamide (508 mg, 4.19 mmol,1.20 eq.) in THF (10.0 mL) was added titanium (IV) ethoxide (7.97 g,34.9 mmol, 7.24 mL, 10.0 eq.), and the mixture was stirred at 75° C. for12 hours. The mixture was then cooled to 25° C. and poured into water(5.00 mL), then the suspension was filtered, and the filtrate wasconcentrated under reduced pressure. The residue was purified by columnchromatography (SiO₂, petroleum ether/ethyl acetate=50/1 to 5/1) to givetert-butyl(S)-(2-(1-((tert-butylsulfinyl)imino)ethyl)-6-(difluoromethyl)pyridin-4-yl)carbamate(1.00 g, 2.57 mmol, 73.5% yield) as a yellow solid.

¹H NMR (400 MHz, CD₃OD) δ=8.30 (s, 1H), 7.94 (d, J=1.6 Hz, 1H),6.52-6.82 (m, 1H), 2.81 (s, 3H), 1.54 (s, 9H), 1.35 (s, 9H).

Step G: To a solution of tert-butyl(S)-(2-(1-((tert-butylsulfinyl)imino)ethyl)-6-(difluoromethyl)pyridin-4-yl)carbamate(1.00 g, 2.57 mmol, 1.00 eq.) in THF (10.0 mL) was added L-selectride(1.0 M, 976 mg, 5.14 mmol, 1.12 mL, 2.00 eq.) dropwise at 0° C., and themixture was stirred at 0-20° C. for 1 hour. The mixture was poured intosaturated ammonium chloride aqueous solution (15.0 mL) and stirred for10 minutes, then extracted with ethyl acetate (15.0 mL×3). The combinedorganic phases were washed with brine (15.0 mL×3), dried over anhydroussodium sulfate, filtered, and filtrate concentrated under reducedpressure. The residue was purified by column chromatography (SiO₂,petroleum ether/ethyl acetate=100/1 to 5/1) to give tert-butyl(2-((R)-1-((S)-tert-butylsulfinyl)amino)ethyl)-6-(difluoromethyl)pyridin-4-yl)carbamate(550 mg, 1.26 mmol, 49.0% yield, 89.5% purity) as a white solid.

¹H NMR (400 MHz, CD₃OD) δ=7.70 (s, 1H), 7.61 (d, J=2.0 Hz, 1H),6.41-6.77 (m, 1H), 4.55 (q, J=6.8 Hz, 1H), 1.58 (d, J=6.8 Hz, 3H), 1.53(s, 9H), 1.23 (s, 9H).

SFC: Column: Chiralcel OD-3 50×4.6 mm I.D., 3 um Mobile phase: Phase Afor CO₂, and Phase B for MeOH (0.05% DEA); Gradient elution: MeOH (0.05%DEA) in CO₂ from 5% to 40% Flow rate: 3 mL/min; Detector: PDA ColumnTemp: 35° C.; Back Pressure: 100 Bar.

Step H: A solution of tert-butyl(2-((R)-1-(((S)-tert-butylsulfinyl)amino)ethyl)-6-(difluoromethyl)pyridin-4-yl)carbamate(450 mg, 1.15 mmol, 1.00 eq.) in hydrochloric acid/dioxane (2.00 mL) wasstirred at 0-20° C. for 1 hour. The mixture was then concentrated underreduced pressure to give a mixture of(R)-2-(1-aminoethyl)-6-(difluoromethyl)pyridin-4-amine and tert-butyl(2-((R)-1-(((S)-tert-butylsulfinyl)amino)ethyl)-6-(difluoromethyl)pyridin-4-yl)carbamateas a white solid which was used directly in the next step directlywithout purification. LCMS [M+1]⁺: 288.2.

¹H NMR (400 MHz, CD₃OD) δ=7.74 (s, 1H), 7.65 (d, J=1.6 Hz, 1H),6.82-6.51 (m, 1H), 4.60-4.45 (m, 2H), 1.61 (d, J=6.8 Hz, 3H), 1.54 (s,9H).

Intermediate AH

Step A: To a solution of 1-(2-fluoro-3-methylphenyl)ethan-1-one (1.00 g,6.57 mmol, 1.00 eq.) and (S)-2-methylpropane-2-sulfinamide (1.04 g, 8.54mmol, 1.30 eq.) in tetrahydrofuran (20.0 mL) were added titaniumtetrisopropyloxide (3.73 g, 13.1 mmol, 3.88 mL, 2.00 eq.) under anitrogen atmosphere, and the mixture was stirred at 70° C. for 12 hoursunder a nitrogen atmosphere. The reaction mixture was cooled to 25° C.and poured into water (40.0 mL) to give a suspension after stirring for10 minutes, the suspension was filtered, the resulting aqueous solutionwas extracted with ethyl acetate (40.0 mL×3). The combined organiclayers were washed with brine (30.0 mL), dried over sodium sulfate,filtered, and concentrated under reduced pressure. The residue waspurified by column chromatography (silica gel, petroleum ether/ethylacetate=50/1 to 2/1) to give (S)—N-(1-(2-fluoro-3-methylphenyl)ethylidene)-2-methylpropane-2-sulfinamide (1.50 g, 5.87 mmol,89.4% yield) as a yellow solid. LCMS [M+1]⁺: 256.2.

¹H NMR (400 MHz, DMSO-d₆) δ=7.46 (br t, J=6.8 Hz, 1H), 7.30-7.24 (m,1H), 7.09-7.04 (m, 1H), 2.76 (br d, J=2.8 Hz, 3H), 2.31 (d, J=2.4 Hz,3H), 1.31 (s, 9H).

Step B: To a solution of(R)—N-(1-(2-fluoro-3-methylphenyl)ethylidene)-2-methylpropane-2-sulfinamide(1.50 g, 5.87 mmol, 1.00 eq.) in tetrahydrofuran (20.0 mL) was addedL-selectride (1.0 M, 11.7 mmol, 11.8 mL, 2.00 eq.) at −78° C. under anitrogen atmosphere, and the mixture was stirred at −78° C. for 2 hours.The reaction mixture was poured into water (10.0 mL) slowly and stirredfor 10 minutes, and the resulting mixed solution was extracted withethyl acetate (10.0 mL×3). The combined organic layers were washed withbrine (10.0 mL), dried over sodium sulfate, filtered, and concentratedunder reduced pressure. The residue was purified by columnchromatography (silica gel, petroleum ether/ethyl acetate=50/1 to 1/1)to give(R)—N-(1-(2-fluoro-3-methylphenyl)ethyl)-2-methylpropane-2-sulfinamide(900 mg, 3.50 mmol, 59.5% yield) as a yellow oil. LCMS [M+1]⁺: 258.4.

¹H NMR (400 MHz, DMSO-d₆) δ=7.16 (t, J=7.6 Hz, 1H), 7.13-7.08 (m, 1H),7.04-6.99 (m, 1H), 4.85 (q, J=6.8 Hz, 1H), 2.28 (d, J=2.0 Hz, 3H), 1.58(d, J=6.8 Hz, 3H), 1.20 (s, 9H).

Step C: To a solution of(S)—N-(1-(2-fluoro-3-methylphenyl)ethyl)-2-methylpropane-2-sulfinamide(900 mg, 3.50 mmol, 1.00 eq.) in dichloromethane (5.00 mL) was added HCl(4.00 M in 1,4-dioxane, 5.00 mL, 5.72 eq.) under nitrogen a atmosphere,and the mixture was stirred at 20° C. for 1 hour. The mixture wasconcentrated to give 1-(2-fluoro-3-methylphenyl)ethan-1-amine (390 mg,crude, hydrochloride salt) as a yellow solid which was used directlywithout further purification.

To a solution of 1-(2-fluoro-3-methylphenyl)ethan-1-amine (300 mg, 1.96mmol, 1.00 eq., hydrochloride salt),1,7-dichloro-4-methylpyrido[3,4-d]pyridazine (419 mg, 1.96 mmol, 1.00eq.), N,N-diisopropylethylamine (506 mg, 3.92 mmol, 2.00 eq.) andpotassium fluoride (341 mg, 5.87 mmol, 0.14 mL, 3.00 eq.) in dimethylsulfoxide (5.00 mL) were stirred at 130° C. for 1 hour under a nitrogenatmosphere. The mixture was then cooled to 25° C., poured into water(20.0 mL), and extracted with ethyl acetate (20.0 mL×3). The combinedorganic layers were washed with brine (20.0 mL), dried over sodiumsulfate, filtered, and concentrated under reduced pressure. The residuewas purified by prep-HPLC [column: Welch Xtimate C18 150×25 mm×5 um;mobile phase: phase A: water(0.05% HCl), phase B: acetonitrile; B %:14%-44%] to give7-chloro-N-(1-(2-fluoro-3-methylphenyl)ethyl)-4-methylpyrido[3,4-d]pyridazin-1-amine(100 mg, 0.30 mmol, 23.2% yield) as a yellow solid. LCMS [M+1]⁺: 331.2.

A racemic 7-chloro-N-(1-(2-fluoro-3-methylphenyl)ethyl)-4-methylpyrido[3,4-d]pyridazin-1-amine (200 mg, 0.60 mmol,1.00 eq.) was purified by SFC (column: DAICEL CHIRALPAK IG (250 mm×30mm, 10 um); mobile phase: phase A: 0.1% NH₄OH in MeOH, phase B: CO₂; B%: 30%-30%] to give(R)-7-chloro-N-(1-(2-fluoro-3-methylphenyl)ethyl)-4-methylpyrido[3,4-d]pyridazin-1-amineas the first eluting isomer (80.0 mg, 0.24 mmol, 40.0% yield) as ayellow solid.

The following Examples are intended to illustrate further certainembodiments of the invention and are not intended to limit the scope ofthe invention.

Example 1-16,7-dimethoxy-N-(1-(4-(2-((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)phthalazin-1-amine

Step A: A mixture of 1-chloro-6,7-dimethoxyphthalazine (120 mg, 534μmol, 1.00 eq.), tert-butyl(2-(5-(1-aminoethyl)thiophen-3-yl)benzyl)(methyl)carbamate (130 mg, 374μmol, 0.70 eq.), BrettPhos Pd G₃ (48.4 mg, 53.4 μmol, 0.10 eq.) andpotassium tert-butoxide (150 mg, 1.34 mmol, 2.50 eq.) in toulene (3.00mL) was degassed and purged with nitrogen 3 times, then the reactionmixture was stirred at 100° C. for 1 hour under a nitrogen atmosphere.The reaction mixture was cooled to 25° C. and filtered, and the filtratewas concentrated under reduced pressure to give a residue. The residuewas purified by prep-TLC (SiO₂, dichloromethane/methanol=10/1) to givetert-butyl(2-(5-(1-((6,7-dimethoxyphthalazin-1-yl)amino)ethyl)thiophen-3-yl)benzyl)(methyl)carbamate(70.0 mg, 24.5% yield) as a brown solid. LCMS [M+1]: 535.5.

Step B: To a solution of tert-butyl(2-(5-(1-((6,7-dimethoxyphthalazin-1-yl)amino)ethyl)thiophen-3-yl)benzyl)(methyl)carbamate(60.0 mg, 112 μmol, 1.00 eq.) in acetonitrile (1.00 mL) was added HCl(4.0 M in dioxane, 0.20 mL). The reaction mixture was stirred at 25° C.for 10 minutes, then the mixture was filtered and concentrated underreduced pressure at 25° C. to give a residue. The residue was dissolvedin methanol (2.00 mL) and adjusted to pH=7 with solid sodium bicarbonate(around 30.0 mg) to give a suspension. The suspension was filtered, andthe filtrate was purified by prep-HPLC (column: Waters Xbridge 150×25mm×5 um; mobile phase: [water(10 mM NH₄HCO₃)-ACN]; B %: 19%-49%, 9 min)and lyophilization to give6,7-dimethoxy-N-(1-(4-(2-((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)phthalazin-1-amine(16.6 mg, 33.8% yield, 99.6% purity) as a white solid. LCMS [M+1]:435.1.

¹H NMR (400 MHz, CD₃OD) δ 8.73 (d, J=2.4 Hz, 1H), 7.75 (s, 1H),7.51-7.46 (m, 1H), 7.43-7.37 (m, 3H), 7.35 (d, J=5.2 Hz, 1H), 7.19 (d,J=1.2 Hz, 1H), 7.16 (s, 1H), 5.93-5.81 (m, 1H), 4.10 (s, 2H), 4.05 (s,3H), 4.00 (s, 3H), 2.45 (s, 3H), 1.83 (d, J=6.8 Hz, 3H).

Example 1-2(R)-7-(1-methyl-1H-pyrazol-4-yl)-N-(1-(4-(2-((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)phthalazin-1-amine

Step A: To a solution of 7-bromophthalazin-1-ol (950 mg, 4.22 mmol, 1.00eq.) in acetonitrile (19.0 mL) was added phosphorus (V) oxychloride(2.27 g, 14.8 mmol, 1.37 mL, 3.50 eq.), the reaction mixture was stirredat 80° C. for 2 hours. The reaction mixture was cooled to 25° C. andconcentrated in vacuo to remove the solvent. The remaining residue wasdiluted with DCM (50.0 mL) cooled to 0° C., and the organic layer wasadjusted to pH=7 with saturated sodium bicarbonate aqueous solution(30.0 mL). The organic phase was separated, washed with brine (30.0mL×2), dried over anhydrous sodium sulfate, filtered, and concentratedunder reduced pressure to give 7-bromo-1-chlorophthalazine (900 mg, 3.70mmol, 87.6% yield) as a brown solid. LCMS [M+3]: 244.8.

¹H NMR (400 MHz, CDCl₃) δ 9.44 (d, J=0.8 Hz, 1H), 8.52-8.49 (m, 1H),8.10 (dd, J=2.0, 8.8 Hz, 1H), 7.90 (d, J=8.4 Hz, 1H).

Step B: To a solution of 7-bromo-1-chlorophthalazine (100 mg, 411 μmol,1.00 eq.) in DMSO (2.00 mL) was added tert-butyl(R)-(2-(5-(1-aminoethyl)thiophen-3-yl)benzyl)(methyl)carbamate (129 mg,370 μmol, 0.90 eq.), potassium fluoride (71.6 mg, 1.23 mmol, 28.8 μL,3.00 eq.) and diisopropylethylamine (106 mg, 821 μmol, 143 μL, 2.00eq.). The reaction mixture was stirred at 130° C. for 4 hours under anitrogen atmosphere. After this time, the reaction mixture was cooled to25° C. Ethyl acetate (10.0 mL) and water (8.00 mL) were added to thereaction mixture and layers were separated, then the aqueous phase wasextracted with ethyl acetate (10.0 mL×2). Combined organic layers werewashed with brine (10.0 mL×2), dried over sodium sulfate, filtered, andconcentrated under reduced pressure to give a residue. The residue waspurified by prep-TLC (SiO₂, petroleum ether/ethyl acetate=1/1) to givetert-butyl(R)-(2-(5-(1-((7-bromophthalazin-1-yl)amino)ethyl)thiophen-3-yl)benzyl)(methyl)carbamate(80.0 mg, 35.2% yield) as a yellow solid. LCMS [M+1]: 553.0.

¹H NMR (400 MHz, CD₃OD) δ 8.80 (s, 1H), 8.56 (s, 1H), 8.20 (s, 1H),8.12-8.07 (m, 2H), 7.91 (br d, J=8.4 Hz, 1H), 7.33-7.25 (m, 3H), 7.19(br d, J=7.2 Hz, 1H), 7.15-7.03 (m, 2H), 5.90-5.97 (m, 1H), 4.45 (br d,J=14.8 Hz, 2H), 3.97 (s, 3H), 2.66 (s, 3H), 1.84 (d, J=6.8 Hz, 3H),1.46-1.29 (m, 9H).

Step D: To a solution of tert-butyl(R)-methyl(2-(5-(1-((7-(1-methyl-1H-pyrazol-4-yl)phthalazin-1-yl)amino)ethyl)thiophen-3-yl)benzyl)carbamate(18.0 mg, 32.5 μmol, 1.00 eq.) in DCM (1.00 mL) was added TFA (770 mg,6.75 mmol, 0.50 mL, 208 eq.). The reaction mixture was stirred at 25° C.for 10 minutes. The reaction mixture was filtered and concentrated underreduced pressure to give a residue. The residue was purified byprep-HPLC (column: Phenomenex Luna C18 75×30 mm×3 um; mobile phase:[water (0.05% HCl)-ACN]; B %: 13%-33%) and lyophilization to give(R)-7-(1-methyl-1H-pyrazol-4-yl)-N-(1-(4-(2-((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)phthalazin-1-amine(9.02 mg, 55.7% yield, 91.1% purity) as a off-white solid. LCMS [M+1]:455.2.

¹H NMR (400 MHz, CD₃OD) δ 9.10 (br s, 1H), 8.49 (s, 1H), 8.39 (dd,J=1.2, 8.4 Hz, 1H), 8.29 (s, 1H), 8.23 (br d, J=8.4 Hz, 1H), 8.17 (s,1H), 8.08 (s, 1H), 7.60-7.57 (m, 1H), 7.50-7.45 (m, 2H), 7.44-7.40 (m,1H), 7.39-7.34 (m, 2H), 5.78 (q, J=6.4 Hz, 1H), 4.30 (s, 2H), 4.04 (s,2H), 4.01 (s, 3H), 2.62 (s, 3H), 1.98 (br d, J=6.8 Hz, 3H).

Example 1-3(R)—N-(1-(4-(2-((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)-7-morpholinophthalazin-1-amine

Step A: A mixture of tert-butyl(R)-(2-(5-(1-((7-bromophthalazin-1-yl)amino)ethyl)thiophen-3-yl)benzyl)(methyl)carbamate(45.0 mg, 81.3 μmol, 1.00 eq.), morpholine (10.6 mg, 122 μmol, 10.7 μL,1.50 eq.), Pd₂(dba)₃ (7.44 mg, 8.13 μmol, 0.10 eq), RuPhos (7.59 mg,16.3 μmol, 0.20 eq) and potassium tert-butoxide (1.00 M in THF, 163 μL,2.00 eq.) in toluene (3.00 mL) was degassed and purged with nitrogen 3times, then the reaction mixture was stirred at 110° C. for 1 hour undera nitrogen atmosphere. The reaction mixture was cooled to 25° C. andconcentrated under reduced pressure to give a residue. The residue waspurified by column chromatography (SiO₂, dichloromethane/methanol=100/1to 20/1) to give tert-butyl(R)-methyl(2-(5-(1-((7-morpholinophthalazin-1-yl)amino)ethyl)thiophen-3-yl)benzyl)carbamate(40.0 mg, 57.2 μmol, 70.3% yield, 80.0% purity) as a yellow solid. LCMS[M+1]: 560.2.

¹H NMR (400 MHz, CDCl₃) δ 8.81 (s, 1H), 7.72 (d, J=8.8 Hz, 1H),7.46-7.41 (m, 1H), 7.35-7.28 (m, 3H), 7.26-7.06 (m, 3H), 7.03 (d, J=1.2Hz, 1H), 6.15-5.95 (m, 1H), 4.80-4.40 (m, 2H), 3.96-3.86 (m, 4H),3.46-3.28 (m, 4H), 2.80-2.52 (m, 3H), 1.83 (d, J=6.8 Hz, 3H), 1.42 (s,9H).

Step B: To a mixture of tert-butyl(R)-methyl(2-(5-(1-((7-morpholinophthalazin-1-yl)amino)ethyl)thiophen-3-yl)benzyl)carbamate(37.0 mg, 52.9 μmol, 1.00 eq) in acetonitrile (1.00 mL) was added HCl(4.00 M in dioxane, 0.50 mL) dropwise at 0° C., the reaction mixture wasstirred at 0° C. for 30 minutes. The mixture was added methanol (2.00mL) and adjusted to pH=7 with solid sodium bicarbonate (around 30.0 mg)to give a suspension, the suspension was filtered, the filtrate wasconcentrated in vacuo to give a residue. The residue was purified byprep-HPLC (column: Waters Xbridge 150×25 mm×5 um; mobile phase: [A:water(10 mM NH₄HCO₃)—B: ACN]; B %: 22%-52%] to give(R)—N-(1-(4-(2-((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)-7-morpholinophthalazin-1-amine(18.3 mg, 38.5 μmol, 72.7% yield, 96.6% purity) as a white solid. LCMS[M+1]: 460.2.

¹H NMR (400 MHz, CD₃OD) δ 8.66 (s, 1H), 7.82 (dd, J=1.2, 8.8 Hz, 1H),7.65-7.60 (m, 1H), 7.55 (d, J=2.0 Hz, 1H), 7.46-7.41 (m, 1H), 7.36-7.30(m, 3H), 7.18 (d, J=5.2 Hz, 2H), 5.94 (q, J=6.8 Hz, 1H), 3.93-3.87 (m,4H), 3.81 (s, 2H), 3.49-3.43 (m, 4H), 2.28 (s, 3H), 1.84 (d, J=6.8 Hz,3H).

Example 1-4(R)—N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-morpholinophthalazin-1-amine

Step A: To a solution of 7-bromo-1-chlorophthalazine (244 mg, 1.00 mmol,1.00 eq.) and (R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethan-1-amine(242 mg, 1.00 mmol, 1.00 eq., hydrochloride) in DMSO (3.00 mL) was addedpotassium fluoride (175 mg, 3.00 mmol, 70.4 μL, 3.00 eq.) and DIEA (259mg, 2.00 mmol, 349 μL, 2.00 eq.), the reaction mixture was stirred at130° C. for 12 hours under a nitrogen atmosphere. The reaction mixturewas cooled to 25° C. and diluted with ethyl acetate (20.0 mL), theorganic layer was washed with brine (20.0 mL×2), dried over anhydroussodium sulfate, filtered and concentrated in vacuo to give a residue.The residue was purified by silica gel chromatography (petroleumether/ethyl acetate=10/1 to 1/1) to give(R)-7-bromo-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine(280 mg, 683 μmol, 68.2% yield) as a brown solid. LCMS [M+1]: 409.9.

¹H NMR (400 MHz, CDCl₃) δ 8.92 (s, 1H), 7.94 (s, 1H), 7.91 (dd, J=1.6,8.4 Hz, 1H), 7.71 (d, J=8.4 Hz, 1H), 7.68 (d, J=7.6 Hz, 1H), 7.58 (d,J=8.0 Hz, 1H), 7.32-7.28 (m, 1H), 6.02-5.94 (m, 1H), 5.14 (br d, J=6.4Hz, 1H), 2.58 (s, 3H), 1.70 (d, J=6.8 Hz, 3H).

Step B: To a solution of(R)-7-bromo-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine(30.0 mg, 73.1 μmol, 1.00 eq.) and morpholine (12.7 mg, 146 μmol, 12.9μL, 2.00 eq.) in dioxane (1.00 mL) was added Pd₂(dba)₃ (6.70 mg, 7.31μmol, 0.10 eq.), RuPhos (6.82 mg, 14.6 μmol, 0.20 eq), and cesiumcarbonate (47.7 mg, 146 μmol, 2.00 eq.) under a nitrogen atmosphere. Thereaction mixture was stirred at 110° C. for 1 hour under a nitrogenatmosphere. The reaction mixture was cooled to 25° C., filtered, andconcentrated in vacuo to give a residue. The residue was purified byprep-TLC (dichloromethane/methanol=10/1) to give a crude product, thecrude product was purified by prep-HPLC (column: Waters Xbridge C18150×50 mm×10 um; mobile phase: [A: water(10 mM NH₄HCO₃), B: ACN]; B %:40%-70%) to give(R)—N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-morpholinophthalazin-1-amine(11.0 mg, 26.2 μmol, 35.8% yield, 99.2% purity) as a white solid. LCMS[M+1]: 417.1.

¹H NMR (400 MHz, CD₃OD) 5=8.56 (s, 1H), 7.79-7.75 (m, 1H), 7.72 (d,J=8.0 Hz, 1H), 7.62-7.57 (m, 2H), 7.49 (d, J=7.2 Hz, 1H), 7.25 (t, J=7.6Hz, 1H), 5.77 (q, J=6.8 Hz, 1H), 3.94-3.84 (m, 4H), 3.51-3.42 (m, 4H),2.61 (s, 3H), 1.64 (d, J=7.2 Hz, 3H).

Following the teachings of General Reaction Scheme III and theprocedures described for the preparation of Examples 1-1-1-4, thefollowing compounds of Formula (I), Examples 1-5 to 1-50 shown in Table1 were prepared:

TABLE 1 Ex. # Structure Spectral Data 1-5

¹H NMR (400 MHz, CD₃OD) δ 8.69 (s, 1H), 7.89 (br d, J = 8.0 Hz, 1H),7.71 (br d, J = 7.6 Hz, 1H), 7.52 (br d, J = 7.6 Hz, 1H), 7.38-7.30 (m,2H), 7.30- 7.23 (m, 1H), 5.69-5.58 (m, 1H), 4.64 (br s, 1H), 3.76- 3.63(m, 3H), 3.52 (br d, J = 11.2 Hz, 1H), 2.61 (s, 3H), 2.30-2.11 (m, 2H),1.67 (br d, (R)-1-(4-(((R)-1-(2-methyl-3- J = 6.4 Hz, 3H). LCMS [M + 1]:(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6- 417.0.yl)pyrrolidin-3-ol 1-6

¹H NMR (400 MHz, CD₃OD) δ = 8.67 (s, 1H), 7.88 (d, J = 8.8 Hz, 1H), 7.74(d, J = 8.0 Hz, 1H), 7.52 (d, J = 8.0 Hz, 1H), 7.41 (d, J = 1.6 Hz, 1H),7.34 (dd, J = 2.0, 8.8 Hz, 1H), 7.30- 7.24 (m, 1H), 5.72 (q, J = 6.8 Hz,1H), 5.19 (t, J = 6.0 Hz, 1H), 4.98-4.93 (m, 1H), 4.36 (dd, J = 5.6,10.8 Hz, 1H), 4.23- 7-((1R,5R)-2,6-diazabicyclo[3.2.0]heptan-2-yl)-N-4.17 (m, 1H), 3.93-3.85 (m, ((R)-1-(2-methyl-3- 1H), 3.49 (dd, J = 2.8,10.4 Hz, (trifluoromethyl)phenyl)ethyl)phthalazin-1-amine 1H), 2.61 (s,3H), 2.51-2.35 (m, 2H), 1.67 (d, J = 6.8 Hz, 3H). LCMS [M + 1]: 428.0.1-7

¹H NMR (400 MHz, CD₃OD) δ 8.57 (s, 1H), 7.77 (d, J = 10.0 Hz, 1H), 7.73(d, J = 7.6 Hz, 1H), 7.63-7.57 (m, 2H), 7.51 (d, J = 7 .6 Hz, 1H), 7.26(t, J = 7.6 Hz, 1H), 5.78 (q, J = 7.2 Hz, 1H), 3.56-3.44 (m, 4H),3.11-2.97 (m, 4H), 2.63 (s, 3H), 1.66 (d, J = 6 .8 Hz, 3H). LCMS [M +1]: 416.2. (R)-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(piperazin-1- yl)phthalazin-1-amine 1-8

¹H NMR (400 MHz, CD₃OD) δ 8.48 (s, 1H), 7.73-7.66 (m, 2H), 7.51-7.46 (m,1H), 7.27- 7.21 (m, 1H), 7.10-7.07 (m, 1H), 7.06-7.00 (m, 1H), 5.74 (q,J = 6.9 Hz, 1H), 4.95-4.90 (m, 1H), 4.28-4.15 (m, 2H), 3.82-3.76 (m,1H), 3.36- 3.32f (m, 1H), 3.16-3.06 (m, 1H), 2.60 (s, 3H), 2.28-2.197-((1R,5R)-2,6-diazabicyclo[3.2.0]heptan-6-yl)-N- (m, 1H), 1.67-1.56 (m,4H). ((R)-1-(2-methyl-3- LCMS [M + 1]: 428.0.(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine 1-9

¹H NMR (400 MHz, CD₃OD) δ 8.48 (s, 1H), 7.75-7.67 (m, 2H), 7.51-7.46 (m,1H), 7.27- 7.18 (m, 2H), 7.17-7.14 (m, 1H), 5.76 (q, J = 6.9 Hz, 1H),4.65-4.59 (m, 1H), 3.72- 3.54 (m, 3H), 3.48-3.41 (m, 1H), 2.61 (s, 3H),2.29-2.06 (m, 2H), 1.64 (d, J = 6.9 Hz, 3H). LCMS [M + 1]: 417.0.(S)-1-(4-(((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6- yl)pyrrolidin-3-ol1-10

¹H NMR (400 MHz, CD₃OD) δ 8.57 (s, 1H), 7.75 (d, J = 9.0 Hz, 1H),7.42-7.36 (m, 2H), 7.33-7.26 (m, 3H), 7.24- 7.22 (m, 1H), 7.17-7.13 (m,2H), 5.95-5.89 (m, 1H), 3.72 (s, 2H), 3.17 (s, 6H), 2.21 (s, 3H), 1.82(d, J = 6.9 Hz, 3H). LCMS [M + 1]: 418.2.(R)-N⁷,N⁷-dimethyl-N¹-(1-(4-(2- ((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)phthalazine-1,7-diamine 1-11

¹H NMR (400 MHz, CD₃OD) δ 8.88 (s, 1H), 8.37-8.33 (m, 1H), 7.97-7.90 (m,3H), 7.44- 7.40 (m, 1H), 7.36-7.28 (m, 3H), 7.20-7.16 (m, 2H), 5.96 (q,J = 6.9 Hz, 1H), 3.75 (s, 2H), 2.24 (s, 3H), 1.83 (d, J = 6.9 Hz, 3H).LCMS [M + 1]: 375.1. (R)-N-(1-(4-(2-((methylamino)methyl)phenyl)thiophen-2- yl)ethyl)phthalazin-1-amine 1-12

¹H NMR (400 MHz, CD₃OD) δ 8.65 (s, 1H), 7.77 (s, 1H), 7.34- 7.13 (m,4H), 7.04-6.98 (m, 1H), 5.52 (q, J = 7.0 Hz, 1H), 4.06 (s, 3H), 4.00 (s,3H), 2.31 (s, 3H), 1.67 (d, J = 7.0 Hz, 3H). LCMS [M + 1]: 324.2(R)-6,7-dimethoxy-N-(1-(m-tolyl)ethyl)phthalazin-1- amine 1-13

¹H NMR (400 MHz, CDCl₃) δ 8.81 (s, 1H), 7.67 (d, J = 7.9 Hz, 1H), 7.55(d, J = 7.9 Hz, 1H), 7.29-7.22 (m, 1H), 7.08 (s, 1H), 6.94 (s, 1H),6.00- 5.93 (m, 1H), 4.94 (d, J = 6.7 Hz, 1H), 4.04 (s, 3H), 4.02 (s,3H), 2.56 (s, 3H), 1.68 (d, J = 6.7 Hz, 3H). LCMS [M + 1]: 392.1.(R)-6,7-dimethoxy-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine 1-14

¹H NMR (400 MHz, CDCl₃) δ 8.86 (s, 1H), 7.43-7.39 (m, 1H), 7.36-7.26 (m,4H), 7.10 (s, 1H), 6.94 (s, 1H), 6.16-6.08 (m, 1H), 5.02 (d, J = 7.9 Hz,1H), 4.06 (s, 3H), 4.05 (s, 4H), 3.73 (s, 2H), 2.38 (s, 3H), 1.84 (d, J= 6.6 Hz, 3H). LCMS [M + 1]: 435.2. (R)-6,7-dimethoxy-N-(1-(4-(2-((methylamino)methyl)phenyl)thiophen-2- yl)ethyl)phthalazin-1-amine 1-15

¹H NMR (400 MHz, CD₃OD) δ 8.64 (s, 1H), 7.79 (d, J = 9.2 Hz, 1H), 7.59(dd, J = 2.0, 8.8 Hz, 1H), 7.52 (d, J = 1.6 Hz, 1H), 7.41 (d, J = 7.2Hz, 1H), 7.36- 7.22 (m, 3H), 7.08 (d, J = 3.6 Hz, 1H), 6.92 (d, J = 3.6Hz, 1H), 5.92 (q, J = 6.8 Hz, 1H), 3.94-3.83 (m, 4H), 3.77 (s, 2H),3.50-3.38 (m, 4H), 2.24 (s, 3H), 1.81 (d, J = 7.2 Hz, 3H). LCMS [M + 1]:460.2. N-(1-(5-(2-((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)-7-morpholinophthalazin-1-amine 1-16

¹H NMR (400 MHz, CD₃OD) δ 9.00 (s, 1H), 8.14 (d, J = 9.2 Hz, 1H), 7.76(dd, J = 2.4, 9.6 Hz, 1H), 7.65 (s, 1H), 7.60- 7.54 (m, 1H), 7.53-7.43(m, 3H), 7.21 (d, J = 3.2 Hz, 1H), 7.01 (d, J = 3.6 Hz, 1H), 5.83- 5.72(m, 1H), 4.34 (s, 2H), 4.26 (s, 2H), 3.97-3.87 (m, 2H), 3.62-3.53 (m,2H), 2.64 (s, 3H), 1.88 (d, J = 6.8 Hz, 3H). LCMS [M + 1]: 473.2.(R)-4-(4-((1-(5-(2- ((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)amino)phthalazin-6-yl)piperazin-2-one 1-17

¹H NMR (400 MHz, CD₃OD) δ 8.93 (s, 1H), 8.10 (d, J = 9.2 Hz, 1H),7.77-7.69 (m, 3H), 7.55 (d, J = 7.6 Hz, 1H), 7.30 (t, J = 8.8 Hz, 1H),5.62-5.55 (m, 1H), 4.30 (s, 2H), 3.97- 3.91 (m, 2H), 3.61-3.55 (m, 2H),2.62 (s, 3H), 1.70 (d, J = 6.8 Hz, 3H). LCMS [M + 1]: 430.3.(R)-4-(4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6- yl)piperazin-2-one1-18

¹H NMR (400 MHz, CD₃OD) δ 8.64 (s, 1H), 7.80 (d, J = 8.8 Hz, 1H),7.66-7.56 (m, 1H), 7.52 (s, 1H), 7.46-7.38 (m, 1H), 7.37-7.21 (m, 3H),7.09 (d, J = 2.8 Hz, 1H), 6.92 (d, J = 2.8 Hz, 1H), 6.02-5.85 (m, 1H),3.91-3.83 (m, 4H), 3.78 (s, 2H), 3.47-3.40 (m, 4H), 2.24 (s, 3H), 1.81(d, J = 6.8 Hz, 3H). LCMS [M + 1]: 460.2. (R)-N-(1-(5-(2-((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)-7-morpholinophthalazin-1-amine 1-19

¹H NMR (400 MHz, CD₃OD) δ = 8.92 (br s, 1H), 8.05 (d, J = 9.2 Hz, 1H),7.59-7.53 (m, 2H), 7.52-7.43 (m, 4H), 7.19 (d, J = 3.2 Hz, 1H), 7.00 (d,J = 3.6 Hz, 1H), 5.82-5.71 (m, 1H), 4.34 (s, 2H), 3.30 (s, 6H), 2.63 (s,3H), 1.86 (d, J = 6.8 Hz, 3H). LCMS [M + 1]: 418.2.(R)-N⁷,N⁷-dimethyl-N¹-(1-(5-(2- ((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)phthalazine-1,7-diamine 1-20

¹H NMR (400 MHz, CD₃OD) δ = 9.10 (s, 1H), 8.79 (d, J = 3.2 Hz, 1H),8.31-8.27 (m, 1H), 8.27-8.22 (m, 1H), 7.58-7.53 (m, 1H), 7.49-7.44 (m,2H), 7.42-7.39 (m, 1H), 7.37 (d, J = 1.2 Hz, 1H), 7.28 (s, 1H),5.79-5.71 (m, 1H), 4.26 (s, 2H), 4.24-4.18 (m, 2H), 4.12 (s, 2H),3.79-3.73 (m, 2H), 2.59 (s, 3H), 1.92 (d, J = 6.8 Hz, 3H); LCMS [M + 1]:473.4. (R)-1-(4-((1-(4-(2- ((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)amino)phthalazin-6-yl)piperazin-2-one 1-21

¹H NMR (400 MHz, CD₃OD) δ = 8.55 (s, 1H), 7.75 (d, J = 9.6 Hz, 1H), 7.71(d, J = 8.0 Hz, 1H), 7.61-7.55 (m, 2H), 7.49 (d, J = 7.2 Hz, 1H), 7.24(t, J = 8.0 Hz, 1H), 5.76 (q, J = 6.8 Hz, 1H), 3.61-3.46 (m, 4H),2.72-2.63 (m, 4H), 2.61 (s, 3H), 2.39 (s, 3H), 1.64 (d, J = 6.8 Hz, 3H).LCMS [M + 1]: (R)-N-(1-(2-methyl-3- 430.2.(trifluoromethyl)phenyl)ethyl)-7-(4-methylpiperazin-1-yl)phthalazin-1-amine 1-22

¹H NMR (400 MHz, CD₃OD) δ = 8.59 (s, 1H), 7.78 (d, J = 8.8 Hz, 1H), 7.70(d, J = 7.6 Hz, 1H), 7.51 (d, J = 8.0 Hz, 1H), 7.25 (t, J = 8.0 Hz, 1H),7.18 (d, J = 2.0 Hz, 1H), 7.10 (dd, J = 2.4, 8.8 Hz, 1H), 5.68 (q, J =6.8 Hz, 1H), 4.99 (t, J = 4.8 Hz, 1H), 4.35-4.29 (m, 1H), 4.28-4.22 (m,1H), 3.85 (dd, 7-((1S,5S)-2,6-diazabicyclo[3.2.0]heptan-6-yl)-N- J =2.8, 9.2 Hz, 1H), 3.38 (dd, ((R)-1-(2-methyl-3- J = 6.8, 11.6 Hz, 1H),3.21-3.09 (trifluoromethyl)phenyl)ethyl)phthalazin-1-amine (m, 1H), 2.60(s, 3H), 2.27 (dd, J = 5.2, 13.6 Hz, 1H), 1.73- 1.67 (m, 1H), 1.65 (d, J= 6.8 Hz, 3H). LCMS [M + 1]⁺: 428.0. 1-23

¹H NMR (400 MHz, CDCl₃) δ = 11.63 (s, 1H), 8.84-8.83 (m, 2H), 7.98 (s,1H), 7.75 (d, J = 9.2 Hz, 1H), 7.46-7.39 (m, 5H), 7.08 (d, J = 3.6 Hz,1H), 6.86 (d, J = 3.6 Hz, 1H), 5.66- 5.63 (m, 1H), 4.72 (d, J = 13.6 Hz,1H), 4.27 (d, J = 13.6 Hz, 1H), 3.82 (t, J = 4.8 Hz, 3H), 3.55 (t, J =4.8 Hz, 3H), 2.68- 2.64 (m, 6H), 1.77 (d, J = 6.8 N-(1-(5-(2- Hz, 3H).LCMS [M + 1]: 474.2. ((dimethylamino)methyl)phenyl)thiophen-2-yl)ethyl)-7-morpholinophthalazin-1-amine 1-24

LCMS [M + 1]: 458.0. (R)-N,N-dimethyl-1-(4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6-yl)azetidine-3-carboxamide 1-25

LCMS [M + 1]: 454.2. (R)-7-(5,6-dihydro-[1,2,4]triazolo[1,5-a]pyrazin-7(8H)-yl)-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine 1-26

LCMS [M + 1]: 458.2. 1,5-dimethyl-4-(4-(((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6- yl)piperazin-2-one1-27

LCMS [M + 1]: 431.2. N-((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(3- methylmorpholino)phthalazin-1-amine1-28

LCMS [M + 1]: 481.2. (R)-7-(2,3-dimethyl-5,6-dihydroimidazo[1,2-a]pyrazin-7(8H)-yl)-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine 1-29

LCMS [M + 1]: 441.1. (R)-7-(4-methyl-1,4-diazepan-1-yl)-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine 1-30

LCMS [M + 1]: 444.0. (R)-1-methyl-4-(4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6- yl)piperazin-2-one1-31

LCMS [M + 1]: 471.2. N-((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(5-methyloctahydro-2H-pyrrolo[3,4-c]pyridin-2- yl)phthalazin-1-amine 1-32

LCMS [M + 1]: 470.2. (R)-7-(6-(dimethylamino)-2-azaspiro[3.3]heptan-2-yl)-N-(1-(2-methyl-3- (trifluoromethyl)phenyl)ethyl)phthalazin-1-amine1-33

LCMS [M + 1]: 470.1. N-((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(1-methyloctahydro-6H-pyrrolo[2,3-c]pyridin-6- yl)phthalazin-1-amine 1-34

LCMS [M + 1]: 485.2. N-((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(7-methyl-2,7-diazaspiro[4.5]decan-2-yl)phthalazin-1-amine 1-35

LCMS [M + 1]: 471.2. N-((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(1-methyloctahydro-5H-pyrrolo[3,2-c]pyridin-5- yl)phthalazin-1-amine 1-36

LCMS [M + 1]: 458.2. 7-(3-(dimethylamino)piperidin-1-yl)-N-((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin- 1-amine 1-37

LCMS [M + 1]: 467.2. (R)-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(3-methyl-5,6-dihydroimidazo[1,5-a]pyrazin-7(8H)-yl)phthalazin- 1-amine 1-38

LCMS [M + 1]: 470.2. N-((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(4-methyloctahydro-1H-pyrrolo[3,2-b]pyridin-1- yl)phthalazin-1-amine 1-39

LCMS [M + 1]: 470.4. N-((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(7-methyl-2,7-diazaspiro[4.4]nonan-2-yl)phthalazin-1-amine 1-40

LCMS [M + 1]: 467.2. (R)-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(2-methyl-5,6-dihydroimidazo[1,2-a]pyrazin-7(8H)-yl)phthalazin- 1-amine 1-41

LCMS [M + 1]: 473.0. N-((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(2,6-dioxa-9-azaspiro[4.5]decan-9-yl)phthalazin-1-amine 1-42

LCMS [M + 1]: 485.2. N-((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(1-methyloctahydro-1,6-naphthyridin-6(2H)- yl)phthalazin-1-amine 1-43

LCMS [M + 1]: 462.1. 7-(3-(fluoromethyl)-4-methylpiperazin-1-yl)-N-((R)-1-(2-methyl-3- (trifluoromethyl)phenyl)ethyl)phthalazin-1-amine 1-44

LCMS [M + 1]: 481.2. 7-(2,8-dimethyl-5,6-dihydroimidazo[1,2-a]pyrazin-7(8H)-yl)-N-((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine 1-45

LCMS [M + 1]: 508.2. (R)-7-(3,4,6,7,8,9-hexahydrobenzo[4,5]imidazo[1,2-a]pyrazin-2(1H)-yl)-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine 1-46

LCMS [M + 1]: 503.2. (R)-7-(3,4-dihydrobenzo[4,5]imidazo[1,2-a]pyrazin-2(1H)-yl)-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine 1-47

LCMS [M + 1]: 535.0. 7-(8-methyl-2-(trifluoromethyl)-5,6-dihydroimidazo[1,2-a]pyrazin-7(8H)-yl)-N-((R)-1- (2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine 1-48

LCMS [M + 1]: 453.2. (R)-7-(5,6-dihydroimidazo[1,5-a]pyrazin-7(8H)-yl)-N-(1-(2-methyl-3- (trifluoromethyl)phenyl)ethyl)phthalazin-1-amine 1-49

LCMS [M + 1]: 470.2. 7-(3-(azetidin-1-yl)piperidin-1-yl)-N-((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin- 1-amine 1-50

LCMS [M + 1]: 472.2. 7-(3-(dimethylamino)azepan-1-yl)-N-((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin- 1-amine

Example 2-1(R)—N-(1-(4-(2-((dimethylamino)methyl)phenyl)thiophen-2-yl)ethyl)-7-morpholinophthalazin-1-amine

To a solution of(R)—N-(1-(4-(2-((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)-7-morpholinophthalazin-1-amine(15.0 mg, 32.6 μmol, 1.00 eq.) in dimethyformamide (0.50 mL) was addedpotassium hydroxide (2.75 mg, 49.0 μmol, 1.50 eq.) at 15° C. and thereaction mixture was stirred at 15° C. for 1 hour. A solution of methyl4-methylbenzenesulfonate (7.90 mg, 42.4 μmol, 1.3 eq) indimethyformamide (0.20 mL) was added dropwise to the reaction mixture.After the dropwise addition had finished, the reaction mixture washeated to 50° C. and stirred for 2 hours. The reaction mixture was thencooled to 25° C., and ethyl acetate (3.00 mL) and water (3.00 mL) wereadded to the mixture. The layers were separated, and the organic phaseswere combined, washed twice with water (3.00 mL), and dried overanhydrous sodium sulfate to give a residue. The residue was purified byprep-HPLC (column: Waters Xbridge 150×25 mm×5 um; mobile phase: [water(0.05% ammonia hydroxide v/v)—ACN]; B %: 32%-62%, 10 min) to give(R)—N-(1-(4-(2-((dimethylamino)methyl)phenyl)thiophen-2-yl)ethyl)-7-morpholinophthalazin-1-amine(1.61 mg, 3.39 μmol, 10.4% yield, 99.7% purity) as an off-white solid.LCMS [M+1]: 474.3.

¹H NMR (400 MHz, CD₃OD) δ 8.65 (s, 1H), 7.81 (d, J=8.8 Hz, 1H), 7.61(dd, J=2.4, 9.2 Hz, 1H), 7.54 (d, J=2.4 Hz, 1H), 7.48-7.41 (m, 1H),7.37-7.29 (m, 3H), 7.21 (d, J=1.2 Hz, 1H), 7.18-7.12 (m, 1H), 5.91 (q,J=6.8 Hz, 1H), 3.90-3.85 (m, 4H), 3.60 (s, 2H), 3.48-3.42 (m, 4H), 2.17(s, 6H), 1.82 (d, J=6.8 Hz, 3H).

Example 2-2N—((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(((S)-pyrrolidin-3-yl)oxy)phthalazin-1-amine

Step A: To a solution of(R)-7-bromo-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine(80.0 mg, 195 μmol, 1.00 eq.) in toluene (2.00 mL) was added sodiumhydride (15.6 mg, 390 μmol, 60.0% purity, 2.00 eq.) at 0° C. under anitrogen atmosphere. Then tert-butyl(S)-3-hydroxypyrrolidine-1-carboxylate (110 mg, 585 μmol, 3.00 eq.),Pd₂(dba)₃ (17.9 mg, 19.5 μmol, 0.10 eq.), and Tol-BINAP (132 mg, 195μmol, 1.00 eq.) was added to the reaction mixture and the mixture washeated to 100° C. for 1 hour. The reaction mixture was cooled to 25° C.,poured into water (20.0 mL) and extracted with ethyl acetate (20.0mL×3). The combined organic phases were concentrated under vacuum togive a residue. The residue was purified by reversed-phase HPLC[water(0.1% TFA)—ACN] to give tert-butyl(S)-3-((4-(((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6-yl)oxy)pyrrolidine-1-carboxylate(35.0 mg, 44.0 μmol, 23.0% yield, 65.0% purity) as a yellow solid. LCMS[M+1]: 517.0.

Step B: To a solution of tert-butyl(S)-3-((4-(((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6-yl)oxy)pyrrolidine-1-carboxylate(35.0 mg, 44.0 μmol, 1.00 eq.) in acetonitrile (1.00 mL) was added HCl(4.00 M in dioxane, 11.0 μL, 1.00 eq.) dropwise at 0° C. under anitrogen atmosphere. The reaction mixture was stirred at 0° C. for 30minutes then concentrated under vacuum to give a residue. The residuewas purified by reversed phase prep-HPLC (column: Phenomenex Gemini-NXC1875×30 mm×3 um; mobile phase: [water(0.1% TFA)—ACN]; B %: 25%-35%) toaffordN—(((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(((S)-pyrrolidin-3-yl)oxy)phthalazin-1-amine(8.01 mg, 18.2 μmol, 41.0% yield, 95% purity) as a yellow solid. LCMS[M+1]: 417.1.

¹H NMR (400 MHz, CD₃OD) δ=9.15 (s, 1H), 8.28-8.21 (m, 2H), 7.80-7.72 (m,2H), 7.59 (d, J=7.6 Hz, 1H), 7.37-7.27 (t, J=7.6 Hz, 1H), 5.67-5.57 (m,2H), 3.80-3.67 (m, 2H), 3.64-3.47 (m, 2H), 2.63 (s, 3H), 2.55-2.46 (m,2H), 1.73 (d, J=6.8 Hz, 3H).

Following the teachings of General Reaction Scheme III and theprocedures described for the preparation of Example 2-2, the followingcompounds of Formula (I), Examples 2-3 to 2-12 shown in Table 2 wereprepared:

TABLE 2 Ex. # Structure Spectral Data 2-3 

(R)-N-(1-(2-methyl-3- (trifluoromethyl)phenyl)ethyl)-7-(piperidin-4-yloxy)phthalazin-1-amine ¹H NMR (400 MHz, CD₃OD) δ 9.14 (s, 1H),8.28-2.11 (m, 2H), 7.83 (dd, J = 2.0, 8.8 Hz, 1H), 7.76 (br d, J = 8.0Hz, 1H), 7.59 (br d, J = 7.6 Hz, 1H), 7.33 (t, J = 7.6 Hz, 1H), 5.62 (q,J = 6.8 Hz, 1H), 5.19- 5.18 (m, 2H), 3.55-3.44 (m, 2H), 3.36-3.35 (m,2H), 2.64 (s, 3H), 2.34-2.32 (m, 2H), 2.26-2.11 (m, 2H), 1.73 (d, J =6.8 Hz, 3H). LCMS [M + 1]: 431.3. 2-4 

N-((R)-1-(2-methyl-3- (trifluoromethyl)phenyl)ethyl)-7-(((S)-tetrahydrofuran-3-yl)oxy)phthalazin-1-amine ¹H NMR (400 MHz, CDCl₃) δ8.92 (s, 1H), 8.58 (s, 1H), 8.09 (s, 1H), 7.75 (d, J = 8.8 Hz, 1H), 7.64d, J = 8.0 Hz, 1H), 7.53-7.50 (m, 2H), 7.21 (t, J = 7.6 Hz, 1H),5.43-5.40 (m, 1H), 5.33 (s, 1H), 4.11-4.04 (m, 3H), 3.96-3.93 (m, 1H),2.52 (s, 3H), 2.50-2.44 (m, 1H), 2.16-2.11 (m, 1H), 1.69- 1.67 (d, J =7.2 Hz, 3H). LCMS [M + 1]: 418.2. 2-5 

N-((R)-1-(2-methyl-3- (trifluoromethyl)phenyl)ethyl)-7-((1,2,2-trimethylpyrrolidin-3-yl)oxy)phthalazin-1-amine LCMS [M + 1]: 459.1.2-6 

(R)-N-(1-(2-methyl-3- (trifluoromethyl)phenyl)ethyl)-7-((1-methylpiperidin-4-yl)oxy)phthalazin-1-amine LCMS [M + 1]: 445.2. 2-7 

N-((R)-1-(2-methyl-3- (trifluoromethyl)phenyl)ethyl)-7-((1-methylpyrrolidin-3-yl)oxy)phthalazin-1-amine LCMS [M + 1]: 431.2. 2-8 

7-((trans)-3-(dimethylamino)cyclobutoxy)-N-((R)-1- (2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine LCMS [M + 1]: 445.2.2-9 

(R)-7-((1-(2-methoxyethyl)piperidin-4-yl)oxy)-N-(1- (2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine LCMS [M + 1]: 489.2.2-10

N-((R)-1-(2-methyl-3- (trifluoromethyl)phenyl)ethyl)-7-((8-methyl-8-azabicyclo[3.2.1]octan-3-yl)oxy)phthalazin-1-amine LCMS [M + 1]: 472.2.2-11

7-(((trans)-3-(dimethylamino)cyclopentyl)oxy)-N- ((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine LCMS [M + 1]: 459.1.2-12

N-((R)-1-(2-methyl-3- (trifluoromethyl)phenyl)ethyl)-7-((octahydroindolizin-7-yl)oxy)phthalazin-1-amine LCMS [M + 1]: 471.1.

Example 3-1(R)—N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(piperazin-1-yl)pyrido[3,4-b]pyridazin-1-amine

Step A: To a solution of 1,7-dichloropyrido[3,4-<7]pyridazine (40.0 mg,200 μmol, 1.00 eq.) and(R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethan-1-amine (40.6 mg, 200μmol, 1.00 eq.) in DMSO (1.00 mL) was added diisopropylethylamine (77.5mg, 600 μmol, 105 μL, 3.00 eq.) and potassium fluoride (34.8 mg, 600μmol, 14.05 μL, 3.00 eq.) under a nitrogen atmosphere. The reactionmixture was stirred at 130° C. for 1 hour under a nitrogen atmosphere,then cooled to 25° C., poured into water (3.00 mL) and stirred for 5minutes. The aqueous phase was extracted with ethyl acetate (5.00 mL×3),and the combined organic phases were washed with brine (3.00 mL×2),dried over anhydrous sodium sulfate, filtered, and concentrated in vacuoto give a residue. The residue was purified by prep-TLC (SiO₂, petroleumether/ethyl acetate=1/1) to give(R)-7-chloro-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)pyrido[3,4-d]pyridazin-1-amine(30.0 mg, 81.8 μmol, 40.9% yield) as a yellow solid. LCMS [M+1]: 367.2.

¹H NMR (400 MHz, CD₃OD) δ=9.14 (s, 1H), 8.95 (s, 1H), 8.49 (s, 1H), 7.69(d, J=7.6 Hz, 1H), 7.51 (d, J=7.6 Hz, 1H), 7.26 (t, J=8.0 Hz, 1H), 5.76(q, J=6.8 Hz, 1H), 2.63 (s, 3H), 1.64 (d, J=6.8 Hz, 3H).

Step B: To a solution of(R)-7-chloro-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)pyrido[3,4-d]pyridazin-1-amine(18.0 mg, 49.1 μmol, 1.00 eq.) and tert-butyl piperazine-1-carboxylate(13.7 mg, 73.6 μmol, 1.50 eq.) in dioxane (0.50 mL) was added potassiumtert-butoxide (1.00 M, 98.2 μL, 2.00 eq.) and RuPhos-Pd-G3 (4.10 mg,4.91 μmol, 0.10 eq.) under a nitrogen atmosphere. The reaction mixturewas stirred at 100° C. for 1 hour then cooled to 25° C. and concentratedunder vacuum to give a residue. The residue was purified by prep-TLC(SiO₂, petroleum ether/ethyl acetate=1/1) to give tert-butyl(R)-4-(1-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)pyrido[3,4-b]pyridazin-7-yl)piperazine-1-carboxylate(18.0 mg, crude) as a yellow solid. LCMS [M+1]: 517.3.

Step C: To a solution of tert-butyl(R)-4-(1-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)pyrido[3,4-d]pyridazin-7-yl)piperazine-1-carboxylate(11.0 mg, 21.3 μmol, 1.00 eq.) in acetonitrile (1.00 mL) was added HClin dioxane (3M, 0.50 mL). The reaction mixture was stirred at 0° C. for1 hour then concentrated in vacuo to give a residue. The residue waspurified by prep-HPLC (column: Phenomenex luna C18 150×25 mm×10 um;mobile phase: [water(0.1% TFA)-ACN]; B %: 10%-40%) to give(R)—N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(piperazin-1-yl)pyrido[3,4-d]pyridazin-1-amine(4.50 mg, 8.48 μmol, 39.8% yield, trifluoroacetic acid salt) as a whitesolid. LCMS [M+1]=417.1.

1H NMR (400 MHz, CD3OD) δ=9.18 (s, 1H), 9.05 (s, 1H), 7.76 (s, 1H), 7.71(d, J=8.0 Hz, 1H), 7.56 (d, J=7.2 Hz, 1H), 7.36-7.27 (m, 1H), 5.58 (q,J=6.8 Hz, 1H), 4.30-4.21 (m, 4H), 3.50-3.38 (m, 4H), 2.61 (s, 3H), 1.69(d, J=6.8 Hz, 3H).

SFC: Chiralpak OJ-3 (50×4.6 mm I.D., 3 um); Mobile phase: Phase A forC02, and Phase B for MeOH (0.05% DEA); Gradient elution: 50% MeOH (0.05%DEA) in C02 from 5% to 40%. Flow rate: 3 mL/min; Detector: PDA; ColumnTemp: 35° C.; Back Pressure: 100 Bar.

Following the teachings of General Reaction Scheme III and theprocedures described for the preparation of Example 3-1, the followingcompounds of Formula (I), Examples 3-2-3-6 shown in Table 3 wereprepared:

TABLE 3 Ex. # Structure Spectral Data 3-2

(R)-N-(1-(4-(2- ((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)-7-morpholinopyrido[3,4-d]pyridazin-1-amine ¹H NMR (400 MHz, CD₃OD) δ8.93 (d, J = 0.8 Hz, 1H), 8.70 (s, 1H), 7.44 (d, J = 6.4 Hz, 1H),7.37-7.29 (m, 4H), 7.22- 7.15 (m, 2H), 5.91 (q, J = 6.8 Hz, 1H),3.87-3.82 (m, 4H), 3.80-3.74 (m, 6H), 2.27 (s, 3H), 1.83 (d, J = 7.2 Hz,3H). LCMS [M + 1]: 461.3. 3-3

(R)-N-(1-(5-(2- ((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)-7-morpholinopyrido[3,4-d]pyridazin-1-amine ¹H NMR (400 MHz, CD₃OD) δ =9.14 (s, 1H), 9.04 (s, 1H), 7.60-7.55 (m, 1H), 7.53-7.49 (m, 2H),7.48-7.44 (m, 2H), 7.20 (d, J = 4.0 Hz, 1H), 7.01 (d, J = 4.0 Hz, 1H),5.73 (q, J = 6.8 Hz, 1H), 4.34 (s, 2H), 4.01- 3.89 (m, 4H), 3.88-3.77(m, 4H), 2.64 (s, 3H), 1.85 (d, J = 7.2 Hz, 3H). LCMS [M + 1]: 461.2.3-4

(R)-7-methoxy-N-(1-(4-(2- ((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)pyrido[3,4-d]pyridazin-1-amine ¹H NMR (400 MHz, CD₃OD) δ9.32-9.30 (m, 1H), 9.25- 9.22 (m, 1H), 7.91-7.89 (m, 1H), 7.59-7.55 (m,1H), 7.51- 7.45 (m, 2H), 7.45-7.39 (m, 1H), 7.37-7.34 (m, 1H), 7.27-7.25 (m, 1H), 5.80-5.73 (m, 1H), 4.28 (s, 2H), 4.19 (s, 3H), 2.60 (s,3H), 1.88 (d, J = 6.9 Hz, 3H). LCMS [M + 1]: 406.1. 3-5

(R)-4-(1-((1-(4-(2- ((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)amino)pyrido[3,4-d]pyridazin-7- yl)piperazin-2-one ¹H NMR (400MHz, CD₃OD) δ 9.20 (s, 1H), 9.09 (s, 1H), 7.59- 7.55 (m, 1H), 7.53-7.46(m, 3H), 7.45-7.39 (m, 1H), 7.33 (d, J = 1.5 Hz, 1H), 7.25-7.23 (m, 1H),5.77 (q, J = 6.8 Hz, 1H), 4.42 (s, 2H), 4.29 (s, 2H), 4.23-4.16 (m, 2H),3.54 (t, J = 5.4 Hz, 2H), 2.61 (s, 3H), 1.88 (d, J = 6.9 Hz, 3H). LCMS[M + 1]: 474.2. 3-6

(R)-1-(1-((1-(4-(2- ((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)amino)pyrido[3,4-d]pyridazin-7- yl)piperazin-2-one ¹H NMR (400MHz, CD₃OD) δ 9.43 (d, J = 0.9 Hz, 1H), 9.19 (d, J = 0.9 Hz, 1H),9.07-9.05 (m, 1H), 7.57-7.51 (m, 1H), 7.48-7.42 (m, 2H), 7.41- 7.36 (m,1H), 7.34 (d, J = 1.5 Hz, 1H), 7.27-7.25 (m, 1H), 5.80-5.74 (m, 1H),4.47- 4.41 (m, 2H), 4.25 (s, 2H), 4.17 (s, 2H), 3.76-3.72 (m, 2H), 2.58(s, 3H), 1.89 (d, J = 6.8 Hz, 3H). LCMS [M + 1]: 474.4.

Example 4-1(R)-6,7-dimethoxy-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine

A mixture of 1-chloro-6,7-dimethoxy-4-methylphthalazine (100 mg, 419μmol, 1.00 eq.), (R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethan-1-amine(85.1 mg, 419 μmol, 1.00 eq.), BrettPhos Pd G3 (38.0 mg, 41.9 μmol, 0.10eq.) and potassium tert-butoxide (1.00 M, 1.26 mL, 3.00 eq.) in toluene(2.00 mL) was degassed and purged with nitrogen 3 times. The reactionmixture was stirred at 100° C. for 1 hour under a nitrogen atmosphere,then cooled to 25° C., filtered, and the filtrate was concentrated underreduced pressure to give a residue. The residue was purified byprep-HPLC (column: Waters Xbridge BEH C18 100×25 mm×5 um; mobile phase:[water (10 mM NH₃HCO₃)—ACN]; B %: 35%-65%) to give(R)-6,7-dimethoxy-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine(8.24 mg, 20.3 μmol, 4.84% yield, 99.8% purity) as a white solid. LCMS[M+1]: 406.2.

¹H NMR (400 MHz, DMSO-d₆) δ=7.83 (s, 1H), 7.76 (d, J=7.6 Hz, 1H), 7.51(d, J=8.0 Hz, 1H), 7.39 (d, J=6.8 Hz, 1H), 7.33-7.27 (m, 1H), 7.22 (s,1H), 5.73-5.64 (m, 1H), 4.01 (s, 3H), 3.95 (s, 3H), 2.58 (s, 6H), 1.55(d, J=7.2 Hz, 3H).

Following the teachings of General Reaction Scheme IV and the proceduredescribed for the preparation of Example 4-1, the following compounds ofFormula (I), Examples 4-2-4-4 shown in Table 4 were prepared:

TABLE 4 Ex. # Structure Spectral Data 4-2

N-(1-(5-(2- ((dimethylamino)methyl)phenyl)thiophen-2-yl)ethyl)-6,7-dimethoxy-4-methylphthalazin-1- amine ¹H NMR (400 MHz,DMSO- d₆) δ 7.74 (s, 1H), 7.44-7.40 (m, 1H), 7.40-7.33 (m, 2H),7.31-7.27 (m, 2H), 7.26 (s, 1H), 7.16 (d, J = 4.0 Hz, 1H), 7.06 (d, J =3.6 Hz, 1H), 5.96- 5.87 (m, 1H), 3.96 (s, 3H), 3.95 (s, 3H), 3.37 (s,2H), 2.66 (s, 3H), 2.10 (s, 6H), 1.72 (d, J = 6.8 Hz, 3H). LCMS [M +1]⁺: 463.2. 4-3

6,7-dimethoxy-4-methyl-N-(1-(5-(2-((methylamino)methyl)phenyl)thiophen-2- yl)ethyl)phthalazin-1-amine ¹HNMR (400 MHz, CDCl₃) δ 7.44 (d, J = 7.2 Hz, 1H), 7.39 (dd, J = 0.8, 7.2Hz, 1H), 7.33- 7.29 (m, 2H), 7.17 (s, 1H), 7.11 (d, J = 3.2 Hz, 1H),7.01 (d, J = 3.6 Hz, 1H), 6.98 (s, 1H), 6.06- 6.02 (m, 1H), 4.98-4.96(m, 1H), 4.06 (s, 6H), 3.85 (s, 2H), 2.80 (s, 3H), 2.41 (s, 3H), 1.83(d, J = 6.8 Hz, 3H). LCMS [M + 1]: 449.2. 4-4

(R)-6,7-dimethoxy-4-methyl-N-(1-(4-(2-((methylamino)methyl)phenyl)thiophen-2- yl)ethyl)phthalazin-1-amine ¹HNMR (400 MHz, DMSO- d₆) δ = 7.74 (s, 1H), 7.47-7.42 (m, 1H), 7.42 (d, J= 1.6 Hz, 1H), 7.34 (d, J = 8.4 Hz, 1H), 7.32-7.24 (m, 5H), 5.97-5.87(m, 1H), 3.97 (s, 3H), 3.96 (s, 3H) 3.57 (s, 2H), 2.66 (s, 3H), 2.22 (s,3H), 1.73 (d, J = 6.8 Hz, 3H). LCMS [M + 1]: 449.2.

Example 5-1(R)—N-(1-(5-(2-((dimethylamino)methyl)phenyl)thiophen-2-yl)ethyl)-4-isopropyl-6,7-dimethoxyphthalazin-1-amine

Step A: A mixture of(R)-1-(5-(2-((dimethylamino)methyl)phenyl)thiophen-2-yl)ethan-1-amine(200 mg, 768 μmol, 0.90 eq.), 1,4-dichloro-6,7-dimethoxy-phthalazine(221 mg, 853 μmol, 1.00 eq.), N, N-diisopropylethylamine (331 mg, 2.56mmol, 446 μL, 3.00 eq.) and potassium fluoride (149 mg, 2.56 mmol, 60.0μL, 3.00 eq.) in DMSO (3.00 mL) was stirred at 130° C. for 12 hours. Thereaction mixture was then cooled to 25° C., then ethyl acetate (5.00 mL)and water (8.00 mL) were added and the layers were separated. Theaqueous phase was extracted with ethyl acetate (10.0 mL×2) and thecombined organic layers were washed with brine (10.0 mL×2), dried oversodium sulfate, filtered, and concentrated under reduced pressure togive a residue. The residue was purified by prep-TLC (SiO₂, petroleumether/ethyl acetate=1/1) to give(R)-4-chloro-N-(1-(5-(2-((dimethylamino)methyl)phenyl)thiophen-2-yl)ethyl)-6,7-dimethoxyphthalazin-1-amine(100 mg, 24.3% yield) as a yellow solid. LCMS [M+1]: 483.0.

¹H NMR (400 MHz, CDCl₃) δ=7.53-7.49 (m, 1H), 7.44 (s, 1H), 7.44-7.40 (m,1H), 7.34-7.29 (m, 2H), 7.13-7.05 (m, 2H), 6.99 (s, 1H), 6.06-5.96 (m,1H), 4.09 (s, 3H), 4.07 (s, 3H), 3.60 (s, 2H), 2.27 (s, 6H), 1.84 (d,J=6.4 Hz, 3H).

Step B: To a solution of(R)-4-chloro-N-(1-(5-(2-((dimethylamino)methyl)phenyl)thiophen-2-yl)ethyl)-6,7-dimethoxyphthalazin-1-amine(40.0 mg, 82.8 μmol, 1.00 eq.) and iron (III) acetylacetonate (80.0 mg,226 μmol, 2.74 eq.) in THF (1.00 mL) and 1-methyl-2-pyrrolidinone (0.01mL) was added isopropylmagnesium chloride (3.00 M in THF, 600 μL, 21.7eq.) dropwise at 0° C. After addition the mixture reaction was stirredat 25° C. for 10 minutes. The reaction mixture was quenched by additionsaturated ammonium chloride solution (5.00 mL), and extracted with ethylacetate (1.00 mL×3). The combined organic layers were washed with brine(2.00 mL×2), dried over sodium sulfate, filtered and concentrated underreduced pressure to give a residue. The residue was purified byprep-HPLC (column: Phenomenex luna C18 150×25 mm×10 um; mobile phase:[water (0.1% TFA)-ACN]; B %: 16%-46%) and lyophilized to give(R)—N-(1-(5-(2-((dimethylamino)methyl)phenyl)thiophen-2-yl)ethyl)-4-isopropyl-6,7-dimethoxyphthalazin-1-amine(10.3 mg, 20.4% yield, 99.0% purity, trifluoroacetic acid salt) as aoff-white solid. LCMS [M+1]: 491.3.

¹H NMR (400 MHz, CD₃OD) δ=8.11 (s, 1H), 7.68 (s, 1H), 7.66-7.63 (m, 1H),7.56-7.47 (m, 3H), 7.26-7.21 (m, 1H), 7.04 (d, J=3.6 Hz, 1H), 5.73-5.60(m, 1H), 4.52 (s, 2H), 4.12 (s, 3H), 4.11 (s, 3H), 3.97-3.88 (m, 1H),2.73 (s, 6H), 1.91 (d, J=6.8 Hz, 3H), 1.53-1.42 (m, 6H).

SFC Conditions: Column: Chiralcel OD-3 50×4.6 mm I.D., 3 um Mobilephase: Phase A for CO2, and Phase B for MeOH (0.05% DEA); Gradientelution: MeOH (0.05% DEA) in CO2 from 5% to 40% Flow rate: 3 mL/min;Detector: PDA Column Temp: 35C; Back Pressure: 100 Bar.

Following the teachings of General Reaction Scheme I and the proceduredescribed for the preparation of Example 5-1, the following compounds ofFormula (I), Examples 5-2-5-3 shown in Table 5 were prepared:

TABLE 5 Ex. # Structure Spectral Data 5-2

N-(1-(5-(2- ((dimethylamino)methyl)phenyl)thiophen-2-yl)ethyl)-4-ethyl-6,7-dimethoxyphthalazin-1-amine ¹H NMR (400 MHz,CD₃OD) δ 8.08 (s, 1H), 7.69-7.64 (m, 2H), 7.58-7.48 (m, 3H), 7.25- 7.23(m, 1H), 7.06-7.02 (m, 1H), 5.73 (q, J = 6.8 Hz, 1H), 4.53 (s, 2H), 4.15(s, 3H), 4.13 (s, 3H), 3.39-3.34 (m, 3H), 2.75 (s, 6H), 1.90 (d, J = 6.9Hz, 3H), 1.48 (t, J = 7.5 Hz, 3H). LCMS [M + 1]: 477.3. 5-3

(R)-6,7-dimethoxy-4-methyl-N-(1-(2-methyl-3-((methylamino)methyl)phenyl)ethyl)phthalazin-1- amine ¹H NMR (400 MHz,CD₃OD) δ = 8.08 (s, 1H), 7.56-7.62 (m, 2H), 7.22-7.35 (m, 2H), 5.50-5.61 (m, 1H), 4.34-4.42 (m, 1H), 4.21-4.28 (m, 1H), 4.16 (s, 3 H), 4.09(s, 3H), 2.85 (s, 3 H), 2.79 (s, 3H), 2.55 (s, 3H), 1.69 (d, J = 6.8 Hz,3H). LCMS [M + 1]⁺ = 381.2.

Example 5-4(R)—N-(1-(5-(2-((dimethylamino)methyl)phenyl)thiophen-2-yl)ethyl)-6,7-dimethoxy-4-(trifluoromethyl)phthalazin-1-amine

Step A: To a solution of 2-bromo-4,5-dimethoxybenzoic acid (0.30 g, 1.15mmol, 1.00 eq.) in tetrahydrofuran (20.0 mL) was added n-BuLi (1.60 M,1.72 mL, 2.40 eq.) at −78° C. under a nitrogen atmosphere. Afterstirring at −78° C. for 1 hour, ethyl 2,2,2-trifluoroacetate (163 mg,1.15 mmol, 159 μL, 1.00 eq.) was added dropwise at the same temperature.The mixture was stirred at −78° C. for 1 hour, warmed to 20° C., andstirred at 20° C. for 3 hours. The reaction mixture was poured into icewater (20.0 mL) and extracted with ethyl acetate (20.0 mL×3). Thecombined organic phases were washed with brine (20.0 mL×3), dried overanhydrous sodium sulfate, filtered, and concentrated under reducedpressure to give a residue. The residue was purified by columnchromatography (SiO₂, petroleum ether/ethyl acetate=5/1 to 0/1) to give4,5-dimethoxy-2-(2,2,2-trifluoroacetyl)benzoic acid (0.10 g, 30.9%yield) as a yellow oil. LCMS [M+1]⁺=279.0.

¹H NMR (400 MHz, CDCl₃) δ=7.30 (s, 1H), 7.11 (s, 1H), 4.03 (s, 3H), 3.98(s, 3H).

Step B: To a suspension of4,5-dimethoxy-2-(2,2,2-trifluoroacetyl)benzoic acid (0.10 g, 359 μmol,1.00 eq.) in ethanol (10.0 mL) was added NH₂NH₂.H₂O (180 mg, 3.59 mmol,175 μL, 10.0 eq.) at 20° C. The mixture was stirred at 100° C. for 3hours. After completion, the reaction was concentrated under reducedpressure to give 6,7-dimethoxy-4-(trifluoromethyl)phthalazin-1(2H)-one(80.0 mg, crude) as a yellow solid. LCMS [M+1]⁺=316.1.

¹H NMR (400 MHz, DMSO-d₆) δ=7.70 (s, 1H), 7.15 (s, 1H), 3.98 (s, 3H),3.96 (s, 3H).

Step C: To a solution of 6,7-dimethoxy-4-(trifluoromethyl)phthalazin-1(2H)-one (300 mg, 1.09 mmol, 1.00 eq.) in POCl₃ (4.95 g, 32.3 mmol, 3.00mL, 29.5 eq.) was added N, N-diisopropylethylamine (707 mg, 5.47 mmol,953 μL, 5.00 eq.) at 25° C. The mixture was stirred at 100° C. for 30minutes. The reaction mixture was concentrated under reduced pressure togive a residue. Then diluted with ethyl acetate (10.0 mL) and pouredinto ice water (10.0 mL), extracted with ethyl acetate (10.0 mL×3). Thecombined organic layers were dried over anhydrous sodium sulfate,filtered, and concentrated under reduced pressure to give a residue. Theresidue was purified by column chromatography (SiO₂, petroleumether/ethyl acetate=10/1 to 1/1) to give1-chloro-6,7-dimethoxy-4-(trifluoromethyl)phthalazine (50.2 mg, 171μmol, 15.7% yield) as a yellow solid. LCMS [M+1]⁺=293.0.

¹H NMR (500 MHz, CDCl₃) δ=7.60 (s, 1H), 7.44 (d, J=1.0 Hz, 1H), 4.15 (s,3H), 4.12 (s, 3H).

Step D: To a solution of(R)-1-(5-(2-((dimethylamino)methyl)phenyl)thiophen-2-yl)ethan-1-amine(50.0 mg, 168 μmol, 1.00 eq., HCl) and1-chloro-6,7-dimethoxy-4-(trifluoromethyl)phthalazine (49.3 mg, 168μmol, 1.00 eq.) in DMSO (1.00 mL) and was added NA-diisopropylethylamine (87.1 mg, 674 μmol, 117 μL, 4.00 eq.) andpotassium fluoride (2.94 mg, 50.5 μmol, 1.18 μL, 0.30 eq.). Aftercompletion, the reaction mixture was filtered and the residue waspurified by prep-HPLC (Column: Agela DuraShell C18 150×25 mm×5 um;mobile phase: phase A: [water(0.05% NH₃H₂O+10 mM NH₄HCO₃)], phase B:acetonitrile; B %: 60%-90%) to give(R)—N-(1-(5-(2-((dimethylamino)methyl)phenyl)thiophen-2-yl)ethyl)-6,7-dimethoxy-4-(trifluoromethyl)phthalazin-1-amine(4.51 mg, 8.72 μmol, 5.18% yield, 99.9% purity) as a white solid. LCMS[M+1]⁺=517.1.

¹H NMR (500 MHz, CDCl₃) δ=7.51-7.46 (m, 1H), 7.43 (dd, J=1.5, 7.0 Hz,1H), 7.36 (d, J=1.5 Hz, 1H), 7.35-7.28 (m, 2H), 7.13 (s, 2H), 6.99 (brs, 1H), 6.20-6.13 (m, 1H), 5.39 (br s, 1H), 4.08 (s, 3H), 4.07 (s, 3H),3.53 (br s, 2H), 2.25 (br s, 6H), 1.87 (d, J=6.5 Hz, 3H).

Example 6-1(R)-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(4-methylpiperazin-1-yl)phthalazin-1-amine

Step A: A mixture of methyl 5-bromo-2-iodobenzoate (5.00 g, 14.7 mmol,1.00 eq.), tributyl(1-ethoxyvinyl)stannane (5.60 g, 15.4 mmol, 5.20 mL,1.05 eq.) and Pd(PPh₃)₂Cl₂ (309 mg, 440 μmol, 0.03 eq.) in dioxane (50.0mL) was degassed and purged with nitrogen for 3 times, and then thereaction mixture was stirred at 80° C. for 10 hours under a nitrogenatmosphere. The reaction mixture was cooled to 25° C., quenched byaddition water (50.0 mL), and then extracted with ethyl acetate (50.0mL×3). The combined organic layers were washed with brine (20.0 mL×3),dried over sodium sulfate, filtered, and concentrated under reducedpressure to give methyl 5-bromo-2-(1-ethoxyvinyl)benzoate (6.00 g,crude) as a yellow oil which was used in the next step directly.

Step B: To a solution of methyl 5-bromo-2-(1-ethoxyvinyl)benzoate (6.00g, crude) in THF (50.0 mL) was added hydrochloric acid aqueous solution(10%, 25.0 mL). The reaction mixture was stirred at 20° C. for 1 hour.To the reaction mixture was added water (50.0 mL), and the aqueous layerwas extracted with ethyl acetate (100 mL×3). The combined organic layerswere washed with brine (30.0 mL×2), dried over sodium sulfate, filtered,and concentrated under reduced pressure to give a residue. The residuewas purified by column chromatography (SiO₂, petroleum ether/ethylacetate=1/0 to 50/1) to give methyl 2-acetyl-5-bromobenzoate (2.50 g,67.0% yield) as a yellow oil.

¹H NMR (400 MHz, CDCl₃) δ=7.97 (d, J=2.0 Hz, 1H), 7.70 (dd, J=2.0, 8.2Hz, 1H), 7.32 (d, J=8.4 Hz, 1H), 3.91 (s, 3H), 2.53 (s, 3H).

Step C: To a solution of methyl 2-acetyl-5-bromobenzoate (1.50 g, 5.83mmol, 1.00 eq.) in ethanol (30.0 mL) was added hydrazine hydrate (876mg, 17.5 mmol, 851 μL, 3.00 eq.). The reaction mixture was stirred at95° C. for 30 minutes. The reaction mixture was then cooled to 25° C.,and concentrated under reduced pressure to give a residue. The residuewas triturated with ethanol for 10 minutes to give a suspension, thesuspension was filtered, and the filter cake was collected and driedunder vacuum to give 7-bromo-4-methylphthalazin-1(2H)-one (0.70 g, 2.93mmol, 50.2% yield) as a white solid. LCMS [M+1]⁺: 239.0.

¹H NMR (400 MHz, DMSO-d₆) δ=12.57 (br s, 1H), 8.32 (d, J=2.0 Hz, 1H),8.11 (dd, J=2.0, 8.4 Hz, 1H), 7.88 (d, J=8.4 Hz, 1H), 2.50 (s, 3H).

Step D: A mixture of 7-bromo-4-methyl-phthalazin-1-ol (1.00 g, 4.18mmol, 1.00 eq), 1-methylpiperazine (628 mg, 6.27 mmol, 696 μL, 1.50 eq),RuPhos (195 mg, 418 μmol, 0.10 eq), Pd₂(dba)₃ (192 mg, 209 μmol, 0.05eq) and t-BuOK (1M in THF, 8.37 mL, 2.00 eq) in dioxane (10.0 mL) wasdegassed and purged with N₂ 3 times, and then the mixture was stirred at110° C. for 1.5 hours under a N₂ atmosphere. The reaction mixture wasquenched by addition of water (20 mL), and then extracted with EtOAc (10mL×3). The combined organic layers were washed with brine (5 mL×2),dried over Na₂SO₄, filtered, and concentrated under reduced pressure togive a residue. The crude product was triturated with EtOAc (3 mL) for10 min to give 4-methyl-7-(4-methylpiperazin-1-yl)phthalazin-1(2H)-one(800 mg, 3.10 mmol, 74.0% yield) as a yellow solid. LCMS [M+1]⁺: 259.1.

¹H NMR (400 MHz, DMSO-d₆) δ=12.13 (s, 1H), 7.74 (d, J=8.8 Hz, 1H), 7.56(dd, J=2.8, 9.0 Hz, 1H), 7.50 (d, J=2.6 Hz, 1H), 3.40-3.34 (m, 4H),2.49-2.45 (m, 4H), 2.43 (s, 3H), 2.23 (s, 3H).

Step E: To a solution of4-methyl-7-(4-methylpiperazin-1-yl)phthalazin-1(2H)-one (100 mg, 387μmol, 1.00 eq) in phosphorus oxychloride (1.61 g, 10.5 mmol, 976 μL,27.1 eq.). The mixture was stirred at 110° C. for 16 hours. The reactionmixture was then cooled to 25° C., and concentrated under vacuum to givea residue. The residue was dissolved in water (10.0 mL) and adjust topH=9 with saturated sodium sulfate, and extracted with ethyl acetate(5.00 mL×2). The organic layer was dried over anhydrous sodium sulfateand concentrated under vacuum to give4-chloro-1-methyl-6-(4-methylpiperazin-1-yl)phthalazine (70.0 mg, crude)as brown solid which used directly without purification. LCMS [M+1]⁺:277.1.

Step F: To a solution of7-chloro-1-methyl-6-(4-methylpiperazin-1-yl)phthalazine (60.0 mg, 217μmol, 1.00 eq.) and(R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethan-1-amine (48.5 mg, 238μmol, 1.10 eq.) in dimethyl sulfoxide (3.00 mL) was added cesiumfluoride (98.8 mg, 650 μmol, 24.0 μL, 3.00 eq.) and N,N-diisopropylethylamine (140 mg, 1.08 mmol, 189 μL, 5.00 eq.). Then themixture was stirred at 120° C. for 16 hours. The reaction mixture wasthen poured into water (1.50 ml) and purified by prep-HPLC (column:Boston Green ODS 150×30 mm×5 um; mobile phase: [water(0.1% TFA)-ACN]; B%: 25%-45%, 10 min). The product was further purified by prep-HPLC(column: Agela DuraShell C18 150×25 mm×5 um; mobile phase: [water (0.05%NH₃H₂O+10 mM NH₄HCO₃)-ACN]; B %: 38%-68%, 10 min) to give(R)-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(4-methylpiperazin-1-yl)phthalazin-1-amine(17.0 mg, 3.83 μmol, 17.6% yield, 99.9% purity) as a white solid. LCMS[M+1]⁺: 444.1.

¹H NMR (500 MHz, CD₃OD) δ=7.91 (d, J=9.50 Hz, 1H), 7.70 (d, J=8.50 Hz,1H), 7.55-7.63 (m, 2H), 7.48 (d, J=8.00 Hz, 1H), 7.23 (t, J=7.50 Hz,1H), 5.75-5.70 (m, 1H), 3.55 (br s, 4H), 2.68 (br t, J=5.00 Hz, 4H),2.59-2.63 (m, 6H), 2.40 (s, 3H), 1.63 (d, J=7.00 Hz, 3H).

Example 6-2(R)-4-methyl-N-(1-(5-(2-((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)-7-morpholinopyrido[3,4-d]pyridazin-1-amine

Step A: To a solution of 5-bromo-2-chloroisonicotinic acid (12.0 g, 50.6mmol, 1.00 eq) in MeOH (100 mL) was added SOCl₂ (7.25 g, 60.9 mmol, 4.42mL, 1.20 eq) dropwise, then the mixture was heated to 75° C. and stirredfor 8 hours. The reaction mixture was then concentrated under reducedpressure to give a residue. The residue was diluted with EtOAc (100 mL),washed with saturated NaHCO₃ (100 mL), dried over Na₂SO₄, filtered, andconcentrated under reduced pressure to give methyl5-bromo-2-chloroisonicotinate (12.0 g, crude) as a yellow oil. LCMS[M+1]⁺: 252.0.

¹H NMR (400 MHz, DMSO-d₆) δ=8.78 (s, 1H), 7.89 (s, 1H), 3.91 (s, 3H).

Step B: A solution of methyl 5-bromo-2-chloroisonicotinate (11.0 g,43.92 mmol, 1.00 eq), tributyl(1-ethoxyvinyl)stannane (16.7 g, 46.1mmol, 15.6 mL, 1.05 eq) and Pd(PPh₃)₂Cl₂ (1.23 g, 1.76 mmol, 0.04 eq) indioxane (110 mL) was degassed and purged with N₂ 3 times, and then themixture was heated at 80° C. for 16 hours under a N₂ atmosphere. Thereaction mixture was then quenched by addition water (400 mL), and thenextracted with EtOAc (150 mL×3). The combined organic layers were washedwith brine (200 mL), dried over Na₂SO₄, filtered, and concentrated underreduced pressure to give methyl 2-chloro-5-(1-ethoxyvinyl)isonicotinate(10.6 g, crude) was obtained as a yellow oil.

Step C: To a solution of methyl 2-chloro-5-(1-ethoxyvinyl)isonicotinate(10.6 g, 43.9 mmol, 1.00 eq) in THF (100 mL) was added HCl (102 g, 280mmol, 100 mL, 10% purity in water, 6.38 eq) dropwise, and the mixturewas stirred at 20° C. for 16 hours. The reaction mixture was thenquenched by addition of NaHCO₃ (300 mL) at 0° C., and then extractedwith EtOAc (100 mL×3). The combined organic layers were washed withbrine (100 mL), dried over Na₂SO₄, filtered, and concentrated underreduced pressure to give a residue. The residue was purified by columnchromatography (SiO₂, Petroleum ether/Ethyl acetate=l/0 to 3/1) to givemethyl 5-acetyl-2-chloroisonicotinate (4.50 g, 21.1 mmol, 48.0% yield)was obtained as a white solid.

¹H NMR (400 MHz, DMSO-d₆) δ=8.98 (s, 1H), 7.85 (s, 1H), 3.84 (s, 3H),2.61 (s, 3H).

Step D: To a solution of methyl 5-acetyl-2-chloroisonicotinate (1.00 g,4.68 mmol, 1.00 eq) in EtOH (15.0 mL) was added hydrazine hydrate (703mg, 14.0 mmol, 683 μL, 3.00 eq), the mixture was stirred at 95° C. for30 minutes. The reaction mixture was then filtered and the filter cakewas concentrated under reduced pressure to give a residue to give7-chloro-4-methylpyrido[3,4-d]pyridazin-1(2H)-one (0.85 g, crude) wasobtained as a white solid. LCMS [M+1]⁺: 196.1.

¹H NMR (400 MHz, DMSO-d₆) δ=9.20 (s, 1H), 8.10 (s, 1H), 2.58 (s, 3H).

Step E: A solution of 7-chloro-4-methylpyrido[3,4-d]pyridazin-1(2H)-one(750 mg, 3.83 mmol, 1.00 eq), morpholine (668 mg, 7.67 mmol, 675 μL,2.00 eq) in dioxane (10.0 mL), tBuOK (1.00 M in THF, 11.5 mL, 3.00 eq),RuPhos (179 mg, 383 μmol, 0.10 eq), Pd₂(dba)₃ (176 mg, 192 μmol, 0.05eq) was degassed and purged with nitrogen 3 times, and the mixture wasstirred at 110° C. for 3 hours under a nitrogen atmosphere. The reactionmixture was filtered, and the filtrate was concentrated under reducedpressure to give a residue. The residue was purified by prep-HPLC(column: Phenomenex luna C18 (250*70 mm, 15 um); mobile phase:[water(0.05% HCl)-ACN]; B %: 10%-40%) to give4-methyl-7-morpholinopyrido[3,4-d]pyridazin-1(2H)-one (500 mg, 2.03mmol, 49.2% yield) was obtained as a white solid. LCMS [M+1]⁺: 247.0.

¹H NMR (400 MHz, DMSO-d₆) δ=12.26 (s, 1H), 8.89 (s, 1H), 7.23 (s, 1H),3.75-3.70 (m, 4H), 3.68-3.63 (m, 4H), 2.46 (s, 3H).

Step F: A solution of7-methyl-7-morpholinopyrido[3,4-d]pyridazin-1(2H)-one (500 mg, 2.03mmol, 1.00 eq) in POCl₃ (6.23 g, 40.6 mmol, 3.77 mL, 20.0 eq), wasstirred at 110° C. for 3 hours. The reaction mixture was thenconcentrated under reduced pressure to remove POCl₃. The residue wasdiluted with H₂O (100 mL), and then adjusted to pH=8 using NaHCO₃ solid,and then extracted with ethyl acetate (50.0 mL×3). The combined organiclayers were washed with brine (50.0 mL), dried over Na₂SO₄, filtered,and concentrated under reduced pressure to give4-(1-chloro-4-methylpyrido[3,4-d]pyridazin-7-yl)morpholine (500 mg,crude) was obtained as a yellow solid. LCMS [M+1]⁺: 264.9.

¹H NMR (400 MHz, CDCl₃) δ=9.13 (s, 1H), 6.89 (s, 1H), 3.92-3.86 (m, 4H),3.81-3.75 (m, 4H), 2.91 (s, 3H).

Step G: To a mixture of4-(1-chloro-4-methylpyrido[3,4-d]pyridazin-7-yl)morpholine (50.0 mg, 189μmol, 1.00 eq.) and tert-butyl(R)-(2-(5-(1-aminoethyl)thiophen-2-yl)benzyl)(methyl)carbamate (65.5 mg,189 μmol, 1.00 eq.) in dimethyl sulfoxide (2.00 mL) was added cesiumfluoride (57.4 mg, 378 μmol, 13.9 μL, 2.00 eq.) and N,N-diisopropylethylamine (48.8 mg, 378 μmol, 65.8 μL, 2.00 eq.) in aglove box. The mixture was stirred at 130° C. for 3 hours then cooled tothe room temperature, and water (30.0 mL) was added to the reactionmixture and extracted with ethyl acetate (3×20 mL). The combined organiclayers were washed with brine (20.0 mL), dried over sodium sulfate,filtered, and concentrated under reduced pressure to give a residue. Theresidue was purified by prep-HPLC (column: Agela DuraShell C18 150×25mm×5 um using water (0.04% NH₄OH+10 mM NH₄HCO₃) and acetonitrile as theeluents. Mobile phase A: water (0.04% NH₃H₂O+10 mM NH₄HCO₃)-ACN, mobilephase B: acetonitrile. Gradient: 24%-54% B) to give tert-butyl(R)-methyl(2-(5-(1-((4-methyl-7-morpholinopyrido[3,4-b]pyridazin-1-yl)amino)ethyl)thiophen-2-yl)benzyl)carbamate(20.0 mg, 34.8 μmol, 18.4% yield) as a yellow solid. LCMS [M+1]⁺: 575.4.

¹H NMR (400 MHz, CD₃OD) 5=9.25 (s, 1H), 7.42 (s, 1H), 7.17-7.37 (m, 5H),7.10 (d, J=3.6 Hz, 1H), 6.86 (br s, 1H), 5.59-5.68 (m, 1H), 4.46-4.52(m, 2H), 3.92 (br s, 4H), 3.76-3.84 (m, 4H), 2.84 (s, 3H), 2.70 (s, 3H),1.80 (d, J=7.2 Hz, 3H), 1.45 (br s, 9H).

Step H: To a mixture of tert-butyl(R)-methyl(2-(5-(1-((4-methyl-7-morpholinopyrido[3,4-b]pyridazin-1-yl)amino)ethyl)thiophen-2-yl)benzyl)carbamate(20.0 mg, 34.8 μmol, 1.00 eq.) in dichloromethane (1.00 mL) was addedtrifluoroacetic acid (0.20 mL). After completion, the mixture wasconcentrated and the residue was purified by prep-HPLC (column: AgelaDuraShell C18 150×25 mm×5 um using water (0.04% NH₃H₂O+10 mM NH₄HCO₃)and acetonitrile as the eluents. Mobile phase A: water (0.04% NH₄OH+10mM NH₄HCO₃), mobile phase B: acetonitrile. Gradient: 35%-65% B) to(R)-4-methyl-N-(1-(5-(2-((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)-7-morpholinopyrido[3,4-b]pyridazin-1-amine(4 mg, 8.43 μmol, 24.2% yield) as a white solid. LCMS [M+1]⁺: 475.3.

¹H NMR (400 MHz, CD₃OD) δ=9.04 (s, 1H), 7.43 (br d, J=6.4 Hz, 1H),7.25-7.36 (m, 4H), 7.08 (d, J=2.8 Hz, 1H), 6.92 (d, J=3.2 Hz, 1H), 5.83(br d, J=6.8 Hz, 1H), 3.80-3.86 (m, 6H), 3.70-3.77 (m, 4H), 2.69 (s,3H), 2.28 (s, 3H), 1.79 (d, J=6.8 Hz, 3H).

Following the teachings of the General Reaction Schemes II & IV, and theprocedure described for the preparation of Examples 6-1, 6-2, 10-1 &10-2, the following compounds of Formula (I), Examples 6-3 to 6-19 shownin Table 6 were prepared:

TABLE 6 Ex. # Structure Spectral Data 6-3 

(R)-4-methyl-N-(1-(5-(2-((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)-7-morpholinophthalazin-1-amine 1H NMR (400 MHz, CD₃OD) δ = 7.93 (d, J =9.2 Hz, 1H), 7.58 (dd, J = 2.8, 9.2 Hz, 1H), 7.51 (d, J = 2.0 Hz, 1H),7.44- 7.39 (m, 1H), 7.35-7.24 (m, 3H), 7.08 (dd, J = 0.8, 3.2 Hz, 1H),6.91 (d, J = 3.6 Hz, 1H), 5.88 (q, J = 7.2 Hz, 1H), 3.90- 3.85 (m, 4H),3.80 (s, 2H), 3.46- 3.40 (m, 4H), 2.67 (s, 3H), 2.25 (s, 3H), 1.80 (d, J= 7.2 Hz, 3H). LCMS [M + 1]⁺: 474.2. 6-4 

(R)-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(piperazin-1- yl)phthalazin-1-amine ¹HNMR (400 MHz, CD₃OD) δ 7.82-7.94 (m, 1H), 7.69 (d, J = 8.0 Hz, 1H),7.55-7.62 (m, 2H), 7.47 (d, J = 7.6 Hz, 1H), 7.22 (t, J = 7.6 Hz, 1H),5.70 (q, J = 6.8 Hz, 1H), 3.49-3.42 (m, 4H), 3.05-2.98 (m, 4H), 2.59 (s,3H), 2.58 (s, 3H), 1.62 (d, J = 7.2 Hz, 3H). LCMS [M + 1]⁺: 430.3. 6-5 

(R)-N-(1-(3-amino-5- (trifluoromethyl)phenyl)ethyl)-4-methyl-7-morpholinophthalazin-1-amine ¹H NMR (400 MHz, CD₃OD) δ = 8.18 (d, J =9.2 Hz, 1H), 7.85 (br s, 3H), 7.73 (d, J = 8.4 Hz, 1H), 7.54 (s, 1H),5.38 (q, J = 6.4 Hz, 1H), 3.91-3.86 (m, 4H), 3.73 (br s, 4H), 2.79 (s,3H), 1.78 (d, J = 7.2 Hz, 3H). LCMS [M + 1]⁺: 432.2. 6-6 

(R)-N-(1-(5-(3-fluoro-2- ((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)-4-methyl-7-morpholinophthalazin-1- amine ¹H NMR (400 MHz,CD₃OD) δ = 7.93 (dd, J = 2.0, 9.2 Hz, 1H), 7.61-7.56 (m, 1H), 7.51 (d, J= 2.0 Hz, 1H), 7.32-7.26 (m, 1H), 7.18 (d, J = 7.6 Hz, 1H), 7.12-7.06(m, 2H), 6.98 (d, J = 3.6 Hz, 1H), 5.89 (q, J = 6.8 Hz, 1H), 3.91-3.85(m, 4H), 3.80 (s, 2H), 3.47-3.40 (m, 4H), 2.67 (s, 3H), 2.21 (s, 3H),1.80 (d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 492.0. 6-7 

(R)-1-methyl-4-(1-methyl-4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin- 6-yl)piperazin-2-one ¹HNMR (400 MHz, CD₃OD) δ 8.40 (d, J = 8.8 Hz, 1H), 7.87- 7.97 (m, 3H),7.73 (d, J = 7.6 Hz, 1H), 7.44-7.52 (m, 1H), 5.74 (q, J = 6.8 Hz, 1H),4.51 (s, 2H), 4.14-4.25 (m, 2H), 3.87 (t, J = 5.2 Hz, 2H), 3.30 (s, 3H),2.97 (s, 3H), 2.83 (s, 3H), 1.88 (d, J = 7.2 Hz, 3H); LCMS [M + 1]⁺:458.2. 6-8 

(R)-4-methyl-N-(1-(2-methyl-3- ((methylamino)methyl)phenyl)ethyl)-7-morpholinophthalazin-1-amine ¹H NMR (500 MHz, CD₃OD) δ = 8.17 (d, J =9.5 Hz, 1H), 7.69- 7.78 (m, 2H), 7.57 (dd, J = 6.5, 1.0 Hz, 1H),7.28-7.31 (m, 1H), 7.22-7.27 (m, 1H), 5.55 (q, J = 7.0 Hz, 1H), 4.40-4.36 (m, 1H), 4.20-4.28 (m, 1H), 3.86-3.93 (m, 4H), 3.64- 3.72 (m, 4H),2.78 (d, J = 4.5 Hz, 6H), 2.55 (s, 3 H), 1.66 (d, J = 7.0 Hz, 3H). LCMS[M + 1]⁺ = 406.1 6-9 

(R)-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(piperazin-1-yl)pyrido[3,4-d]pyridazin-1-amine ¹H NMR (400 MHz, CD₃OD) δ = 9.30 (s,1H), 7.74 (s, 1H), 7.69 (d, J = 8.0 Hz, 1H), 7.54 (d, J = 8.0 Hz, 1H),7.28 (t, J = 7.6 Hz, 1H), 5.51 (q, J = 7.2 Hz, 1H), 4.20-4.28 (m, 4H),3.40-3.46 (m, 4H), 2.81 (s, 3H), 2.61 (s, 3H), 1.66 (d, J = 6.8 Hz, 3H);LCMS [M + 1]⁺: 431.3. 6-10

(R)-7-(6,7-dihydropyrazolo[1,5-a]pyrazin-5(4H)-yl)-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1- amine ¹H NMR (400 MHz,CD₃OD) δ 8.22 (d, J = 9.2 Hz, 1H), 7.90- 7.81 (m, 2H), 7.70 (d, J = 7.6Hz, 1H), 7.56-7.50 (m, 2H), 7.32-7.23 (m, 1H), 6.29 (d, J = 2.0 Hz, 1H),5.54 (q, J = 6.8 Hz, 1H), 5.01 (s, 2H), 4.44- 4.37 (m, 2H), 4.31-4.24(m, 2H), 2.77 (s, 3H), 2.63 (s, 3H), 1.68 (d, J = 7.2 Hz, 3H). LCMS [M +1]⁺: 467.2. 6-11

(R)-cyclopropyl(4-(1-methyl-4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6-yl)piperazin-1-yl)methanone ¹H NMR (400 MHz, CD₃OD) δ 8.17 (d, J = 9.2Hz, 1H), 7.78- 7.65 (m, 3H), 7.52 (d, J = 7.6 Hz, 1H), 7.31-7.22 (m,1H), 5.52 (q, J = 6.8 Hz, 1H), 4.05 (br s, 2H), 3.90-3.76 (m, 6H), 2.75(s, 3H), 2.62 (s, 3H), 2.08- 1.97 (m, 1H), 1.66 (d, J = 6.8 Hz, 3H),0.97-0.84 (m, 4H). LCMS [M + 1]⁺: 498.2. 6-12

(R)-4-methyl-N-(1-(2-methyl-3- (trifluoromethyl)phenyl)ethyl)-7-morpholinopyrido[3,4-d]pyridazin-1-amine ¹H NMR (400 MHz, CD₃OD) δ =9.00 (s, 1H), 7.67 (br d, J = 7.6 Hz, 1H), 7.48 (br d, J = 7.2 Hz, 1H),7.33 (s, 1H), 7.23 (br t, J = 8.0 Hz, 1H), 5.67 (q, J = 6.8 Hz, 1H),3.89-3.81 (m, 4H), 3.80-3.71 (m, 4H), 2.63- 2.58 (m, 6H), 1.61 (d, J =6.8 Hz, 3H). LCMS [M + 1]⁺: 432.2. 6-13

(R)-N-(1-(5-(3-fluoro-2- ((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)-4-methyl-7-morpholinopyrido[3,4- d]pyridazin-1-amine ¹H NMR(400 MHz, CD₃OD) δ = 9.03 (d, J = 0.4 Hz, 1H), 7.33- 7.26 (m, 1H), 7.25(s, 1H), 7.19-7.16 (m, 1H), 7.13-7.06 (m, 2H), 6.99 (d, J = 3.6 Hz, 1H),5.85 (q, J = 6.8 Hz, 1H), 3.84-3.79 (m, 6H), 3.76-3.72 (m, 4H), 2.69 (s,3H), 2.23 (s, 3H), 1.79 (d, J = 7.2 Hz, 3H). LCMS [M + 1]⁺: 493.2. 6-14

(R)-N-(1-(3-fluoro-5- (trifluoromethyl)phenyl)ethyl)-4-methyl-7-morpholinopyrido[3,4-d]pyridazin-1-amine ¹H NMR (400 MHz, DMSO- d₆) δ =9.03 (s, 1H), 7.63 (s, 1H), 7.59-7.48 (m, 3H), 7.39 (s, 1H), 5.48 (t, J= 6.8 Hz, 1H), 3.86-3.76 (m, 4H), 3.75- 3.66 (m, 4H), 2.58 (s, 3H), 1.61(d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 436.3. 6-15

(R)-3-(1-((4-methyl-7-morpholinophthalazin-1-yl)amino)ethyl)benzonitrile ¹H NMR (400 MHz, CD₃OD) δ = 8.20-8.14 (m,1H), 7.84- 7.77 (m, 1H), 7.82-7.69 (m, 3H), 7.60 (br d, J = 7.6 Hz, 1H),7.54-7.47 (m, 1H), 5.29 (q, J = 7.2 Hz, 1H), 3.92-3.88 (m, 4H),3.73-3.65 (m, 4H), 2.78 (s, 3H), 1.72 (d, J = 7.2 Hz, 3H). LCMS [M +1]⁺: 374.2. 6-16

(R)-3-(1-((4-methyl-7-morpholinopyrido[3,4-d]pyridazin-1-yl)amino)ethyl)benzonitrile ¹H NMR (400 MHz, MeOD-d₄) δ =9.25 (s, 1H), 7.84-7.73 (m, 2H), 7.61 (d, J = 7.6 Hz, 1H), 7.55-7.46 (m,2H), 5.26 (q, J = 6.8 Hz, 1H), 4.00-3.94 (m, 1H), 4.04-3.93 (m, 3H),3.88- 3.83 (m, 2H), 3.88-3.81 (m, 1H), 3.88-3.80 (m, 1H), 2.80 (s, 3H),1.71 (d, J = 7.2 Hz, 3H). LCMS [M + 1]⁺: 375.1. 6-17

(R)-3-fluoro-5-(1-((4-methyl-7- morpholinopyrido[3,4-d]pyridazin-1-yl)amino)ethyl)benzonitrile ¹H NMR (400 MHz, CD₃OD) δ = 9.01 (d, J = 0.8Hz, 1H), 7.63 (t, J = 1.2 Hz, 1H), 7.51 (dt, J = 9.6, 2.0 Hz, 1H),7.32-7.37 (m, 1H), 7.29 (d, J = 0.4 Hz, 1H), 5.39 (q, J = 7.2 Hz, 1H),3.81- 3.86 (m, 4H), 3.74-3.79 (m, 4H), 2.64 (s, 3H), 1.66 (d, J = 7.2Hz, 3H). LCMS [M + 1]⁺: 393.2. 6-18

(R)-N-(1-(3-chloro-2-methylphenyl)ethyl)-4-methyl-7-morpholinopyrido[3,4-d]pyridazin-1- amine ¹H NMR (400 MHz,CD₃OD) δ = 9.23 (s, 1H), 7.53 (s, 1H), 7.35 (d, J = 8.0 Hz, 1H), 7.25(d, J = 7.6 Hz, 1H), 7.13-7.06 (m, 1H), 5.43 (q, J = 6.8 Hz, 1H),3.99-3.93 (m, 4H), 3.89- 3.80 (m, 4H), 2.78 (s, 3H), 2.54 (s, 3H), 1.64(d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 398.2. 6-19

(R)-4-methyl-N-(1-(2-methyl-3- (methylsulfonyl)phenyl)ethyl)-7-morpholinopyrido[3,4-d]pyridazin-1-amine ¹H NMR (400 MHz, DMSO- d₆) δ =9.01 (s, 1H), 7.79 (dd, J = 12.4, 8.0 Hz, 2H), 7.55 (d, J = 6.8 Hz, 1H),7.45-7.36 (m, 2H), 5.71-5.61 (m, 1H), 3.82- 3.77 (m, 4H), 3.76-3.67 (m,4H), 3.26 (s, 3H), 2.80 (s, 3H), 2.57 (s, 3H), 1.56 (d, J = 6.8 Hz, 3H).LCMS [M + 1]⁺: 442.1.

Example 7-14-methyl-N—((R)-1-(5-(2-((methylamino)methyl(phenyl)thiophen-2-yl)ethyl)-7-(((S)-tetrahydrofuran-3-yl)oxy)phthalazin-1-amine

Step A: To a mixture of 1-(4-(benzyloxy)-2-hydroxyphenyl)ethan-1-one(5.00 g, 20.6 mmol, 1.00 eq.) and pyridine (4.90 g, 61.9 mmol, 5.00 mL,3.00 eq.) in DCM (100 mL) was added trifluoromethylsulfonyltrifluoromethanesulfonate (11.7 g, 41.3 mmol, 6.81 mL, 2.00 eg) dropwiseslowly at 0° C. under a nitrogen atmosphere. Then the reaction mixturewas stirred at 20° C. for 16 hours. The reaction mixture was poured intowater (100 mL) and stirred for 5 minutes. The aqueous phase wasextracted with DCM (50.0 mL×3). The combined organic phases were washedwith brine (50.0 mL), dried over anhydrous sodium sulfate, filtered, andconcentrated under vacuum to give a residue. The residue was purified bysilica gel chromatography (SiO₂, petroleum ether/ethyl acetate=10/l to3/1) to give 2-acetyl-5-(benzyloxy)phenyl trifluoromethanesulfonate(7.40 g, 17.8 mmol, 86.2% yield, 90% purity) as a yellow solid. LCMS[M+1]⁺: 374.8.

¹H NMR (400 MHz, CDCl₃) δ=7.85 (d, J=8.8 Hz, 1H), 7.44-7.36 (m, 5H),7.03 (dd, J=2.4, 8.8 Hz, 1H), 6.90 (d, J=2.4 Hz, 1H), 5.14 (s, 2H), 2.60(s, 3H).

Step B: To a mixture of 2-acetyl-5-(benzyloxy)phenyltrifluoromethanesulfonate (13.0 g, 34.7 mmol, 1.00 eq.) and1,1-bis(diphenylphosphino)ferrocene (1.93 g, 3.47 mmol, 0.10 eq.) in DMF(100 mL) and methanol (10.0 mL) was added triethylamine (17.6 g, 174mmol, 24.2 mL, 5.00 eq.) and palladium (II) acetate (780 mg, 3.47 mmol,0.10 eq.) in one portion at 20° C. under a nitrogen atmosphere. Thereaction mixture was heated to 80° C. stirred for 16 hours under anatmosphere of carbon monoxide (50 Psi). The mixture was then cooled to15° C. and concentrated under reduced pressure at 40° C. to give aresidue. The residue was poured into water (100 mL) and stirred for 5minutes. The aqueous phase was extracted with ethyl acetate (50.0 mL×3).The combined organic phases were washed with brine (50.0 mL), dried overanhydrous sodium sulfate, filtered, and concentrated under reducedpressure to give a residue. The residue was purified by silica gelchromatography (SiO₂, petroleum ether/ethyl acetate=5/1 to 4/1) toafford methyl 2-acetyl-5-(benzyloxy)benzoate (5.60 g, 16.9 mmol, 48.8%yield, 86% purity) as a yellow solid. LCMS [M+1]⁺: 285.0.

¹H NMR (400 MHz, CDCl₃) δ=7.58 (d, J=8.8 Hz, 1H), 7.44-7.35 (m, 5H),7.26 (d, J=2.8 Hz, 1H), 7.08 (dd, J=2.4, 8.4 Hz, 1H), 5.14 (s, 2H), 3.91(s, 3H), 2.53 (s, 3H).

Step C: To a solution of methyl 2-acetyl-5-(benzyloxy)benzoate (4.60 g,16.2 mmol, 1.00 eq) in ethanol (50.0 mL) was added hydrazine hydrate(2.48 g, 48.5 mmol, 2.41 mL, 98% purity, 3.00 eq) dropwise slowly at 25°C., then the reaction mixture was stirred at 95° C. for 30 minutes. Thereaction mixture was cooled to 15° C. and poured into ice-water(w/w=1/1) (100 mL) and stirred for 5 minutes to give a suspension. Theresulting suspension was filtered, and the filter cake was collected anddried under reduced pressure to afford7-(benzyloxy)-4-methylphthalazin-1(2H)-one (4.00 g, crude) as a yellowsolid. LCMS [M+1]⁺: 267.0.

Step D: 7-(benzyloxy)-4-methylphthalazin-1(2H)-one (860 mg, 3.23 mmol,1.00 eq) was added to phosphorus oxychloride (14.2 g, 92.6 mmol, 8.60mL, 28.7 eq) in portions at 25° C., then the reaction mixture wasstirred at 120° C. for 3 hours. The mixture was cooled to 25° C. andconcentrated under reduced pressure to give a residue. The residue waspoured into ice-water (50.0 mL) slowly and adjusted to pH=8 withsaturated sodium bicarbonate aqueous solution (50.0 mL) and stirred for5 minutes. The aqueous phase was extracted with ethyl acetate (50.0mL×3). The combined organic phases were washed with brine (50.0 mL),dried over anhydrous sodium sulfate, filtered, and concentrated underreduced pressure to give 6 6-(benzyloxy)-4-chloro-1-methylphthalazine(740 mg, crude) as a white solid. LCMS [M+1]⁺: 284.9.

Step E: To a solution of 6-(benzyloxy)-4-chloro-1-methylphthalazine (120mg, 421 μmol, 1.00 eq.) and tert-butyl(R)-(2-(5-(1-aminoethyl)thiophen-2-yl)benzyl)(methyl)carbamate (102 mg,295 μmol, 0.70 eq.) in dimethyl sulfoxide (1.00 mL) was added cesiumfluoride (192 mg, 1.26 mmol, 46.6 μL, 3.00 eq.). Then the mixture wasstirred at 130° C. for 16 hours and the mixture diluted with ethylacetate (30.0 mL). The combined organic fractions were washed with brine(3×8 mL), dried over sodium sulfate, filtered, and the solvent wasevaporated under reduced pressure to give a residue. The residue waspurified by silica gel column flash chromatography 12 g, eluting withpetroleum ether/ethyl acetate=0-100% to give tert-butyl(R)-(2-(5-(1-((7-(benzyloxy)-4-methylphthalazin-1-yl)amino)ethyl)thiophen-2-yl)benzyl)(methyl)carbamate(60.0 mg, 44.2 μmol, 10.5% yield, 43.8% purity) as a brown solid. LCMS[M+1]+: 595.3.

Step F: To a solution of tert-butyl(R)-(2-(5-(1-((7-(benzyloxy)-4-methylphthalazin-1-yl)amino)ethyl)thiophen-2-yl)benzyl)(methyl)carbamate(60.0 mg, 100 μmol, 1.00 eq.) in methanol (3.00 mL) was added Pd/C (10.7mg, 10.1 μmol, 10% purity, 0.10 eq.). Then the mixture was stirred at30° C. for 3 hours. The mixture was then filtered and the filter cakewas washed with methanol (5.00 mL) and dichloromethane (10.0 ml). Thefiltrate was concentrated to under reduced pressure. The crude productwas purified by reversed-phase HPLC (column: Phenomenex Synergi C18150×30 mm×4 um; mobile phase: phase A: [water (0.1% TFA)], phase B:acetonitrile; B %: 42%-62%) to give tert-butyl(R)-(2-(5-(1-((7-hydroxy-4-methylphthalazin-1-yl)amino)ethyl)thiophen-2-yl)benzyl)(methyl)carbamate(15.0 mg, 29.7 μmol, 29.5% yield) as a white solid. LCMS [M+1]⁺: 505.3.

Step G: To a solution of tert-butyl(R)-(2-(5-(1-((7-hydroxy-4-methylphthalazin-1-yl)amino)ethyl)thiophen-2-yl)benzyl)(methyl)carbamate(13.0 mg, 25.8 μmol, 1.00 eq.) and (R)-tetrahydrofuran-3-yl4-methylbenzenesulfonate (9.16 mg, 30.9 μmol, 1.20 eq.) in DMF (0.10 mL)was added cesium fluoride (15.0 mg, 98.8 μmol, 3.64 μL, 3.83 eq.). Themixture was stirred at 90° C. for 2 hours then poured into water (5.00mL) and filtered. The filtrate was extracted with ethyl acetate (10mL×2) and the combined organic layers were washed with brine (10.0 mL),dried over anhydrous sodium sulfate and concentrated under vacuum togive a residue tert-butylmethyl(2-(5-((R)-1-((4-methyl-7-(((S)-tetrahydrofuran-3-yl)oxy)phthalazin-1-yl)amino)ethyl)thiophen-2-yl)benzyl)carbamate(14.8 mg, 25.8 μmol, 100% yield) was obtained as a yellow oil which wasused without further purification. LCMS [M+1]⁺: 575.3.

Step H: To a solution of tert-butyl methyl(2-(5-((R)-1-((4-methyl-7-(((S)-tetrahydrofuran-3-yl)oxy)phthalazin-1-yl)amino)ethyl)thiophen-2-yl)benzyl)carbamate(10.0 mg, 17.4 μmol, 1.00 eq.) in dichloromethane (0.50 mL) was added2,6-lutidine (18.6 mg, 173 μmol, 20.3 μL, 10.0 eq.) followed by TMSOTf(19.3 mg, 87.0 μmol, 15.7 μL, 5.00 eq.) was added to the mixture. Themixture was stirred at 20° C. for 1 hour, then the solvent wasevaporated under a nitrogen atmosphere. The crude product was purifiedby reversed-phase HPLC (column: Agela DuraShell C18 150×25 mm×5 um;mobile phase: phase A: [water (0.05% NH₃H₂O+10 mM NH₄HCO₃)], phase B:acetonitrile; B %: 36%-66%) to give4-methyl-N—((R)-1-(5-(2-((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)-7-(((S)-tetrahydrofuran-3-yl)oxy)phthalazin-1-amine(2.20 mg, 4.64 μmol, 26.6% yield) as a white solid. LCMS [M+1]⁺: 475.2.

¹H NMR (400 MHz, CD₃OD) δ=8.02 (d, J=8.8 Hz, 1H), 7.70 (d, J=2.4 Hz,1H), 7.39-7.52 (m, 2H), 7.25-7.38 (m, 3H), 7.09 (d, J=2.8 Hz, 1H), 6.92(d, J=3.2 Hz, 1H), 5.90 (q, J=6.8 Hz, 1H), 5.30 (br s, 1H), 3.88-4.09(m, 4H), 3.81 (s, 2H), 2.72 (s, 3H), 2.29-2.44 (m, 1H), 2.26 (s, 3H),2.18 (br dd, J=5.6, 12.0 Hz, 1H), 1.81 (d, J=7.2 Hz, 3H).

Following the teachings of the General Reaction Scheme VI, and theprocedure described for the preparation of Example 7-1, the followingcompounds of Formula (I), Examples 7-2 to 7-7 shown in Table 7 wereprepared.

TABLE 7 Ex. # Structure Spectral Data 7-2

(R)-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(piperidin-4- yloxy)phthalazin-1-amine¹H NMR (400 MHz, CD₃OD) δ = 8.35 (d, J = 9.2 Hz, 1H), 8.18 (br d, J =2.0 Hz, 1H), 7.79 (dd, J = 2.4, 9.2 Hz, 1H), 7.70 (br d, J = 8.4 Hz,1H), 7.54 (br d, J = 7.6 Hz, 1H), 7.28 (br t, J = 8.4 Hz, 1H), 5.57 (q,J = 7.2 Hz, 1H), 5.17 (br s, 1H), 3.47 (br d, J = 9.2 Hz, 2H), 2.83 (s,3H), 2.64 (s, 3H), 2.33 (br s, 2H), 2.22 (br s, 2H), 1.68 (d, J = 7.2Hz, 3H). LCMS [M + 1]⁺: 445.2. 7-3

4-methyl-N-((R)-1-(2-methyl-3- (trifluoromethyl)phenyl)ethyl)-7-(((S)-pyrrolidin-3-yl)oxy)phthalazin-1-amine ¹H NMR (400 MHz, CD₃OD) δ =8.44-8.22 (m, 2H), 7.85- 7.68 (m, 2H), 7.53 (br d, J = 7.6 Hz, 1H), 7.28(br t, J = 7.6 Hz, 1H), 5.73 (br s, 1H), 5.57 (q, J = 7.2 Hz, 1H),3.81-3.67 (m, 2H), 3.65-3.51 (m, 2H), 2.85 (s, 3H), 2.65 (s, 2H), 2.62-2.41 (m, 2H), 1.73 (d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 431.3. 7-4

(R)-7-(azetidin-3-yloxy)-4-methyl-N-(1-(2- methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1- amine ¹H NMR (500 MHz,CD₃OD) δ 8.38 (d, J = 9.0 Hz, 1H), 8.19 (s, 1H), 7.83 (d, J = 7.8 Hz,1H), 7.76 (dd, J = 9.0, 2.4 Hz, 1H), 7.52 (d, J = 7.9 Hz, 1H), 7.27 (t,J = 8.0 Hz, 1H), 5.71- 5.65 (m, 1H), 5.56 (q, J = 7.0 Hz, 1H), 4.85-4.77(m, 2H), 4.34-4.26 (m, 2H), 2.84 (s, 3H), 2.63 (s, 3H), 1.73 (d, J = 7.0Hz, 3H). LCMS [M + 1]⁺: 417.2. 7-5

4-methyl-N-((R)-1-(2-methyl-3- (trifluoromethyl)phenyl)ethyl)-7-(((S)-1-methylpyrrolidin-3-yl)oxy)phthalazin-1-amine ¹H NMR (400 MHz, CD₃OD) δ =8.40 (br d, J = 8.8 Hz, 1H), 8.30 (br s, 1H), 7.85-7.74 (m, 2H), 7.56(br d, J = 8.0 Hz, 1H), 7.30 (br t, J = 8.0 Hz, 1H), 5.79-5.67 (m, 1H),5.59 (q, J = 6.8 Hz, 1H), 4.36-3.89 (m, 2H), 3.72-3.45 (m, 2H), 3.17-3.06 (m, 3H), 3.01-2.91 (m, 1H), 2.87 (s, 3H), 2.70-2.61 (m, 3H),2.61-2.37 (m, 1H), 1.74 (br d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 445.2.7-6

4-methyl-N-((R)-1-(2-methyl-3- (trifluoromethyl)phenyl)ethyl)-7-(((S)-pyrrolidin-2-yl)methoxy)phthalazin-1-amine ¹H NMR (400 MHz, CD₃OD) δ =7.97 (d, J = 9.2 Hz, 1H), 7.80 (d, J = 2.4 Hz, 1H), 7.71 (d, J = 8.0 Hz,1H), 7.52-7.46 (m, 2H), 7.23 (t, J = 7.6 Hz, 1H), 5.73 (q, J = 6.8 Hz,1H), 4.28- 4.22 (m, 1H), 4.13 (dd, J = 7.2, 9.2 Hz, 1H), 3.67-3.59 (m,1H), 3.08-2.96 (m, 2H), 2.64 (s, 3H),2.62 (s, 3H), 2.13- 2.05 (m, 1H),1.96-1.84 (m, 2H), 1.73-1.66 (m, 1H), 1.63 (d, J = 7.2 Hz, 3H). LCMS[M + 1]⁺: 445.2. 7-7

4-methyl-N-((R)-1-(2-methyl-3- (trifluoromethyl)phenyl)ethyl)-7-(((R)-pyrrolidin-2-yl)methoxy)phthalazin-1-amine hydrochloride salt ¹H NMR(400 MHz, CD₃OD) δ = 8.40-8.38 (m, 2H), 7.91- 7.78 (m, 2H), 7.55 (br d,J = 7.6 Hz, 1H), 7.30 (br t, J = 7.6 Hz, 1H), 5.60 (q, J = 7.2 Hz, 1H),4.76 (dd, J = 3.2, 10.8 Hz, 1H), 4.70-4.59 (m, 1H), 4.23 (dq, J = 3.2,8.0 Hz, 1H), 3.55- 3.41 (m, 2H), 2.88 (s, 3H), 2.66 (s, 3H), 2.41 (dtd,J = 4.8, 7.6, 12.8 Hz, 1H), 2.33-2.11 (m, 2H), 2.11-2.00 (m, 1H), 1.75(d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 445.2.

Following the teachings of the General Reaction Scheme IV, and theprocedure described for the preparation of Example 8-3 (below), thefollowing compounds of Formula (I), Example 8-1 may be prepared andExample 8-2 shown in Table 8 was prepared:

Example 8-1 (R)-4,7-dimethyl-N-(1-(5-(2-((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)phthalazin-1-amine

TABLE 8 Ex. # Structure Spectral Data 8-2

(R)-7-ethyl-4-methyl-N-(1-(5-(2- ((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)phthalazin-1-amine ¹H NMR (400 MHz, CD₃OD) δ 8.17 (s, 1H), 8.00(d, J = 8.4 Hz, 1H), 7.80 (d, J = 8.4 Hz, 1H), 7.42 (d, J = 7.4 Hz, 1H),7.37-7.25 (m, 3H), 7.09 (d, J = 3.5 Hz, 1H), 6.92 (d, J = 3.6 Hz, 1H),5.90 (q, J = 7.0 Hz, 1H), 3.80 (s, 2H), 2.92 (q, J = 7.6 Hz, 2H), 2.25(s, 3H), 1.81 (d, J = 6.9 Hz, 3H), 1.37 (t, J = 7.6 Hz, 3H). LCMS [M +1]⁺: 417.2

Example 8-3

(R)-7-methoxy-4-methyl-N-(1-(5-(2-((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)phthalazin-1-amine

Step A: To a solution of methyl 2-bromo-5-methoxybenzoate (3.00 g, 12.2mmol, 1.00 eq.) and tributyl(1-ethoxyvinyl)stannane (4.64 g, 12.9 mmol,4.34 mL, 1.05 eq) in dioxane (30.0 mL) was added Pd(PPh₃)₂Cl₂ (258 mg,367 μmol, 0.03 eq.). Then the mixture was stirred at 80° C. for 18 hoursunder a nitrogen atmosphere. The reaction mixture was then poured intowater (30.0 mL) and extracted with ethyl acetate (30.0 mL×2). Theorganic layer was washed with brine (30.0 mL), dried over anhydroussodium sulfate and concentrated under vacuum. The mixture was useddirectly without further purification to give methyl2-(1-ethoxyvinyl)-5-methoxybenzoate (2.80 g, 11.9 mmol, 96.8% yield,assume 100% purity) as a brown oil. LCMS [M+1]⁺: 237.1.

Step B: A mixture of methyl 2-(1-ethoxyvinyl)-5-methoxybenzoate (2.50 g,10.6 mmol, 1.00 eq.) and 10% aqueous hydrogen chloride (386 mg, 10.6mmol, 378 μL, 1.00 eq.) in THF (20.0 mL) was stirred at 20° C. for 1hour. The reaction mixture was then poured into water (20.0 mL) andextracted with ethyl acetate (25.0 mL×3). The organic layer was washedwith brine (50.0 mL), dried over anhydrous sodium sulfate andconcentrated under vacuum to give a residue. The residue was purified byflash silica gel chromatography (0-20% ethyl acetate/petroleum ether) togive methyl 2-acetyl-5-methoxybenzoate (1.40 g, 5.72 mmol, 54.1% yield,85.1% purity) as a yellow oil. LCMS [M+1]⁺: 209.0.

¹H NMR (400 MHz, CD₃OD) δ=2.51 (s, 3H) 3.86 (d, J=10.0 Hz, 6H) 7.06-7.15(m, 2H) 7.70-7.79 (m, 1H).

Step C: To a solution of methyl 2-acetyl-5-methoxybenzoate (1.30 g, 6.24mmol, 1.00 eq.) in ethanol (15.0 mL) was added hydrazine hydrate (938mg, 18.7 mmol, 910 μL, 98% purity, 3.00 eq.). Then the mixture wasstirred at 80° C. for 1 hour under a nitrogen atmosphere. The reactionmixture was then poured into water (20.0 mL) and extracted with ethylacetate (30.0 mL×2). The organic layer was washed with brine (30.0 mL),dried over anhydrous sodium sulfate, and concentrated under vacuum togive a residue. The crude product was used into the next step withoutpurification to give 7-methoxy-4-methylphthalazin-1 (2H)-one (1.10 g,5.74 mmol, 91.9% yield, 99.3% purity) as a white solid. LCMS [M+1]⁺:191.0.

Step D: A mixture of 7-methoxy-4-methylphthalazin-1(2H)-one (0.90 g,4.73 mmol, 1.00 eq.) and phosphorus oxychloride (15.2 g, 99.4 mmol, 9.23mL, 21.0 eq.) was stirred at 115° C. for 18 hours. The mixture was thenpoured into water (25.0 mL). The saturated sodium carbonate solution wasadded until pH=9. The mixture was extracted with ethyl acetate (2×25.0mL). The combined organic phases were washed with brine (saturated, 20.0mL), dried over sodium sulfate, filtered, and the solvent was evaporatedunder reduced pressure. The residue was purified by columnchromatography by prep-TLC (SiO₂, dichloromethane:methyl alcohol=10:1)to give 4-chloro-6-methoxy-1-methylphthalazine (240 mg, 1.14 mmol, 24.0%yield, 98.8% purity) as a white solid. LCMS [M+1]⁺: 209.0.

Step E: A mixture of tert-butyl(R)-(2-(5-(1-aminoethyl)thiophen-2-yl)benzyl)(methyl)carbamate (49.3 mg,142 μmol, 0.99 eq.), 4-chloro-6-methoxy-1-methylphthalazine (30.0 mg,144 μmol, 1.00 eq.) and cesium fluoride (66.0 mg, 435 μmol, 16.0 μL,3.02 eq.) in dimethyl sulfoxide (1.00 mL) was stirred at 130° C. for 18hours. The mixture was then cooled to 25° C., diluted with ethyl acetate(5.00 mL), washed with brine (3.00×5 mL), dried over sodium sulfate,filtered, and the solvent was evaporated under reduced pressure to givea residue. The residue was purified by prep-HPLC (column: Boston GreenODS 150×30 mm×5 um; mobile phase: phase A: [water(0.1% TFA)], phase B:acetonitrile; B %: 38%-68%) to give tert-butyl(R)-(2-(5-(1-((7-methoxy-4-methylphthalazin-1-yl)amino)ethyl)thiophen-2-yl)benzyl)(methyl)carbamate(10.0 mg, 18.7 μmol, 13.0% yield, 96.8% purity) as a white solid. LCMS[M+1]⁺: 519.2.

Step F: To a mixture of tert-butyl(R)-(2-(5-(1-((7-methoxy-4-methylphthalazin-1-yl)amino)ethyl)thiophen-2-yl)benzyl)(methyl)carbamate(8.00 mg, 15.4 μmol, 1.00 eq.) and 2,6-lutidine (16.5 mg, 154 μmol, 18.0μL, 10.0 eq.) in dichloromethane (2.00 mL) was added TMSOTf (24.0 mg,108 μmol, 19.5 μL, 7.00 eq.), then it was stirred at 20° C. for 2 hoursunder a nitrogen atmosphere. To the mixture was added N, N-diisopropylethyl amine (0.10 ml) and the mixture was concentrated under reducedpressure to give a residue. The residue was purified by prep-HPLC(column: Agela DuraShell C18 150×25 mm×5 um; mobile phase: phase A:[water (0.05% NH₃H₂O+10 mM NH₄HCO₃)], phase B: acetonitrile; B %:38%-68%) to give (R)-7-methoxy-4-methyl-N-(1-(5-(2-((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)phthalazin-1-amine(3.00 mg, 7.10 μmol, 46.0% yield, 99.0% purity) as a white solid. LCMS[M+1]⁺: 419.2.

¹H NMR (500 MHz, CD₃OD) δ=8.01 (d, J=9.0 Hz, 1H), 7.73 (d, J=2.5 Hz,1H), 7.49 (dd, J=9.0, 2.5 Hz, 1H), 7.44 (d, J=6.5 Hz, 1H), 7.33-7.37 (m,2H), 7.26-7.34 (m, 1H), 7.10 (d, J=3.0 Hz, 1H), 6.93 (d, J=3.5 Hz, 1H),5.85-5.96 (m, 1H), 4.02 (s, 3H), 3.86 (s, 2H), 2.73 (s, 3H), 2.29 (s,3H), 1.82 (d, J=7.0 Hz, 3H).

Example 9-1(R)-4-methoxy-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(piperazin-1-yl)phthalazin-1-amine

Step A: To a solution of 6-bromo-2,3-dihydrophthalazine-1,4-dione (3.00g, 12.4 mmol, 1.00 eq.) in phosphorus oxychloride (40.0 mL) was added NA-diisopropylethylamine (4.02 g, 31.1 mmol, 5.42 mL, 2.50 eq.) dropwiseat 25° C. The reaction was then stirred at 120° C. for 12 hours. Themixture was cooled to 25° C. and concentrated in vacuo to remove most ofthe phosphorus oxychloride and give a residue. The residue was pouredinto ice water (100 mL), and the resulting aqueous solution was adjustedto pH=7 with saturated sodium bicarbonate aqueous solution and thenextracted with dichloromethane (50.0 mL×2). The combined organic phaseswere washed with brine (30.0 mL×2), dried over anhydrous sodium sulfate,filtered, and concentrated under vacuum to give6-bromo-1,4-dichlorophthalazine (1.20 g, 4.32 mmol, crude) as a yellowsolid without further purification. LCMS [M+3]⁺: 279.0.

Step B: To a mixture of 6-bromo-1,4-dichlorophthalazine (500 mg, 1.80mmol, 1.00 eq.) and(R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethan-1-amine (365 mg, 1.80mmol, 1.00 eq.) in DMSO (10.0 mL) was added potassium fluoride (313 mg,5.40 mmol, 126 μL, 3.00 eq.), N N-diisopropylethylamine (465 mg, 3.60mmol, 627 μL, 2.00 eq.) under a nitrogen atmosphere. The reactionmixture was then stirred at 130° C. for 3 hours. After this time, thereaction was cooled to 25° C., diluted with ethyl acetate (20.0 mL),washed with brine (5.00 mL×2), dried over anhydrous sodium sulfate,filtered, and concentrated under vacuum to give a residue. The residuewas purified by preparative TLC (petroleum ether/ethyl acetate=3/1) togive(R)-7-bromo-4-chloro-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine(360 mg, 769 μmol, 42.7% yield) as a white solid. LCMS [M+3]⁺: 446.1.

¹H NMR (400 MHz, CDCl₃) δ=8.15-8.01 (m, 2H), 7.99-7.79 (m, 1H), 7.63 (d,J=8.0 Hz, 1H), 7.56-7.50 (m, 1H), 7.23 (s, 1H), 5.91-5.77 (m, 1H), 5.45(br d, J=6.4 Hz, 1H), 2.55 (s, 3H), 1.65 (d, J=6.8 Hz, 3H).

Step C: To a mixture of(R)-7-bromo-4-chloro-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine(330 mg, 742 μmol, 1.00 eq.) in methanol (5.00 mL) was added sodiummethoxide (200 mg, 3.71 mmol, 5.00 eq.) under nitrogen. The reactionmixture was stirred for 2 hours at 110° C. in a microwave reactor. Thereaction mixture was then cooled to 25° C., and concentrated underreduced pressure to give a residue. The residue was purified by columnchromatography (SiO₂, petroleum ether/ethyl acetate=50/1 to 1/1) to give(R)-7-bromo-4-methoxy-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine(281 mg, 638 μmol, 86.0% yield) as a white solid.

Step D: To a solution of(R)-7-bromo-4-methoxy-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine(240 mg, 545 μmol, 4.00 eq.) and tert-butyl piperazine-1-carboxylate(25.4 mg, 136 μmol, 1.00 eq.) in dioxane (5.00 mL) was added RuPhos PdG3 (5.70 mg, 6.81 μmol, 0.05 eq.) and cesium carbonate (178 mg, 545μmol, 4.00 eq.) in one portion at 20° C. under a nitrogen atmosphere.The mixture was stirred at 110° C. for 3 hours. LCMS showed the reactionwas completed. The suspension was filtered through a pad of celite andthe filter cake was washed with ethyl acetate (30.0 mL). The combinedfiltrates were concentrated to give a residue. The residue was purifiedby prep-HPLC (column: Phenomenex Synergi C18 150×30 mm×4 um, mobilephase A: water (0.1% TFA), mobile phase B: acetonitrile. Gradient:49%69% B) to give tert-butyl(R)-4-(1-methoxy-4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6-yl)piperazine-1-carboxylate(70.0 mg, 128 μmol, 94.1% yield) as a white solid. LCMS [M+1]⁺: 546.3.

Step E: To a mixture of tert-butyl(R)-4-(1-methoxy-4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6-yl)piperazine-1-carboxylate(50.0 mg, 91.6 μmol, 1.00 eq.) in dichloromethane (1.00 mL) was addedtrifluoroacetic acid (0.20 mL). The mixture was stirred at 20° C. for 1hour. LCMS showed the reaction was completed. The mixture wasconcentrated under reduced pressure to give a residue. The residue waspurified by prep-HPLC (column: Phenomenex Synergi C18 100×21.2 mm×4 umusing TFA water and acetonitrile as the eluents. Mobile phase A: water(0.1% TFA), mobile phase B: acetonitrile. Gradient: 14%44% B) to(R)-4-methoxy-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(piperazin-1-yl)phthalazin-1-amine(35.0 mg, 78.6 μmol, 85.7% yield) as a white solid. LCMS [M+1]⁺: 446.2.

¹H NMR (400 MHz, CD₃OD) δ=8.18 (d, J=9.2 Hz, 1H), 8.06 (d, J=2.8 Hz,1H), 7.82 (dd, J=2.4, 9.2 Hz, 1H), 7.64-7.77 (m, 2H), 7.36-7.46 (m, 1H),5.42 (q, J=6.4 Hz, 1H), 4.07 (s, 3H), 3.75-3.86 (m, 4H), 3.38-3.47 (m,4H), 2.51 (s, 3H), 1.80 (d, J=6.8 Hz, 3H).

Following the teachings of the General Reaction Scheme III, and theprocedure described for the preparation of Example 9-1, the followingcompound of Formula (I), Example 9-2 shown in Table 9 was prepared:

TABLE 9 Ex. # Structure Spectral Data 9-2

(R)-N¹,N¹-dimethyl-N⁴-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-6-(piperazin-1-yl)phthalazine-1,4-diamine 1H NMR (500 MHz, CD₃OD) δ = 8.26 (d, J = 9.0Hz, 1H), 7.81 (br s, 1H), 7.67 (br d, J = 7.5 Hz, 2H), 7.52 (br d, J =8.0 Hz, 1H), 7.17-7.32 (m, 1H), 5.43 (q, J = 7.5 Hz, 1H), 3.92 (br s,4H), 3.44-3.48 (m, 4H), 3.23 (br s, 6H), 2.58 (s, 3H), 1.63 (br d, J =7.0 Hz, 3H). LCMS [M + 1]⁺: 459.2

Example 10-1(R)-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(piperidin-4-yl)phthalazin-1-amine

Step A: A mixture of 7-bromo-4-methylphthalazin-1(2H)-one (4 g, 16.73mmol, 1.00 eq.) in POCl₃ (75.54 g, 492.66 mmol, 45.78 mL, 29.44 eq.) wasstirred at 20° C. under a N₂ atmosphere then heat to 100° C. and stirredfor 5 hours. The mixture was cooled to 20° C. and concentrated underreduced pressure. The residue was slowly poured into water andneutralized with sat. NaHCO₃ until pH=8. Then the ethyl acetate (100 mL)was added to the mixture and stirred for 30 minutes at 25° C. Themixture was filtered and the after cake was collected. The residue waspurified using a silica gel column (0-55% petroleum ether/EtOAc) to givethe 6-bromo-4-chloro-1-methylphthalazine (2.2 g, 8.54 mmol, 51.06%yield) as a yellow solid.

¹H NMR (500 MHz, DMSO-d₆) δ 8.41 (d, J=1.5 Hz, 1H), 8.29-8.34 (m, 1H),8.24-8.28 (m, 1H), 2.89-2.93 (m, 3H).

Step B: To a mixture of 6-bromo-4-chloro-1-methylphthalazine (0.6 g,2.32 mmol, 1.00 eq) and(R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethan-1-amine (472 mg, 2.32mmol, 1.00 eq) in DMSO (4 mL) was added N, N-diisopropylethylamine (602mg, 2.33 mmol, 810 μL, 2.00 eq) and CsF (706 mg, 4.66 mmol, 2.00 eq) inone portion at 20° C. under a N₂ atmosphere. The mixture was stirred at130° C. for 3 hours. After this time the reaction was cooled to roomtemperature, water (50 mL) was added to the reaction mixture andextracted with ethyl acetate (3×30 mL). The combined organic layers werewashed with brine (saturated, 20 mL), dried over Na₂SO₄, filtered, andconcentrated to give a residue. The residue was purified using apreparative TLC plate eluting with 50% EtOAc/peteroleum ether to give(R)-7-bromo-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine(0.6 g, 1414 μmol, 60.70% yield) as a yellow oil.

Note: the reaction needed to be set up in glove box under a N₂atmosphere to avoid moisture. All of reagents including solvent (DMSO)need to be dried.

¹H NMR (400 MHz, CDCl₃) δ 7.97 (s, 1H), 7.87-7.93 (m, 1H), 7.79-7.85 (m,1H), 7.66 (d, J=7.6 Hz, 1H), 7.54 (d, J=7.6 Hz, 1H), 7.26-7.29 (m, 1H),5.88 (quint, J=6.4 Hz, 1H), 5.12 (br s, 1H), 2.78 (s, 3H), 2.57 (s, 3H),1.66 (d, J=6.8 Hz, 3H).

Step C: To a mixture of(R)-7-bromo-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine(35.0 mg, 82.5 μmol, 1.00 eq.) and tert-butyl4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,6-dihydropyridine-1(2H)-carboxylate(38.3 mg, 124 μmol, 1.50 eq.) in tetrahydrofuran (3.00 mL) and water(0.60 mL) was added sodium carbonate (26.2 mg, 247 μmol, 3.00 eq.) andPd(dppf)Cl₂ (6.04 mg, 8.25 μmol, 0.10 eq.) in one portion at 20° C.under a nitrogen atmosphere. The mixture was stirred at 80° C. for 2hours then cooled to the room temperature, and the mixture was dilutedwith ethyl acetate (30.0 mL), washed with water (10.0 mL×3). Thecombined organic layers were washed with brine (20.0 mL), dried oversodium sulfate and filtered. The filtrate was concentrated to give thecrude product as yellow oil. The yellow oil was purified by prep-TLC(SiO₂, petroleum ether/ethyl acetate=2/1) to give tert-butyl(R)-4-(1-methyl-4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6-yl)-3,6-dihydropyridine-1(2H)-carboxylate (32.0 mg, 60.8 μmol, 73.7% yield) as a yellow oil. LCMS[M+1]⁺: 527.3.

Step D: To a solution of tert-butyl(R)-4-(1-methyl-4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6-yl)-3,6-dihydropyridine-1(2H)-carboxylate (14.0 mg, 26.6 μmol, 1.00 eq.) in methanol (3.00 mL)was added Pd/C (3.62 mg, 3.41 μmol, 10% purity, 0.13 eq.) under anitrogen atmosphere. The suspension was degassed under vacuum and purgedwith hydrogen several times. The mixture was stirred under hydrogen(15.0 psi) at 25° C. for 2 hours then filtered through a pad of celiteand the filter cake was washed with ethyl acetate (30.0 mL). Thecombined filtrates were concentrated to give tert-butyl(R)-4-(1-methyl-4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6-yl)piperidine-1-carboxylate(14.0 mg, 26.5 μmol, 99.6% yield) as a yellow oil. The crude product wasused directly in next step without further purification. LCMS [M+1]⁺:529.3.

Step E: A mixture of tert-butyl(R)-4-(1-methyl-4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6-yl)piperidine-1-carboxylate(14 mg, 26.5 μmol, 1.00 eq.) in dichloromethane (2.00 mL) andtrifluoroacetic acid (0.40 mL) was stirred at 20° C. for 2 hours thenconcentrated to give a residue. The residue was purified by prep-HPLC(column: Phenomenex Synergi C18 150×30 mm×4 um using TFA water andacetonitrile as the eluents, mobile phase A: water (0.1% TFA), mobilephase B: acetonitrile. Gradient: 20%-50% B) to give(R)-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(piperidin-4-yl)phthalazin-1-amine(9.00 mg, 21.0 μmol, 79.3% yield) as a yellow solid. LCMS [M+1]⁺: 429.1.

¹H NMR (400 MHz, CD₃OD) δ=8.67 (s, 1H), 8.37 (d, J=8.8 Hz, 1H), 8.12 (d,J=8.4 Hz, 1H), 7.73 (d, J=8.4 Hz, 1H), 7.55 (d, J=8.0 Hz, 1H), 7.29 (t,J=7.6 Hz, 1H), 5.57 (q, J=6.8 Hz, 1H), 3.61 (br d, J=12.8 Hz, 2H),3.20-3.30 (m, 3H), 2.87 (s, 3H), 2.63 (s, 3H), 2.21-2.32 (m, 2H),2.05-2.20 (m, 2H), 1.71 (d, J=6.8 Hz, 3H).

Example 10-2(R)—N-(1-(5-(2-((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)-7-morpholino-4-(trifluoromethyl)phthalazin-1-amine

Step A: To a solution of dimethyl 4-bromophthalate (2.00 g, 7.32 mmol,1.00 eq.) in 1,2-dimethoxyethane (25.0 mL) was added CsF (223 mg, 1.46mmol, 54.0 μL, 0.20 eq.) and TMSCF₃ (1.25 g, 8.79 mmol, 1.20 eq.). Themixture was stirred between 0-25° C. for 1 hour. The mixture was thenpartitioned between ethyl acetate (1.00 mL) and water (15.0 mL). Theorganic phases were separated, washed with brine (15.0 mL×3), dried overanhydrous sodium sulfate, filtered, and concentrated under reducedpressure to give a mixture of6-bromo-3-methoxy-3-(trifluoromethyl)isobenzofuran-1 (3H)-one and5-bromo-3-methoxy-3-(trifluoromethyl)isobenzofuran-1(3H)-one (2.20 g,crude) as a colorless oil.

Step B: To a solution of6-bromo-3-methoxy-3-(trifluoromethyl)isobenzofuran-1(3H)-one and5-bromo-3-methoxy-3-(trifluoromethyl)isobenzofuran-1 (3H)-one (2.20 g,7.07 mmol, 1.00 eq.) in THF (25.0 mL) was added hydrazine hydrate (708mg, 14.6 mmol, 688 μL, 2.00 eq.). The mixture was stirred at 75° C. for18 hours then concentrated under reduced pressure to remove solvent. Theresidue was purified by flash silica gel chromatography (SiO₂, Petroleumether/Ethyl acetate=10/1 to 8/1) to give7-bromo-4-(trifluoromethyl)phthalazin-1 (2H)-one (680 mg, 2.32 mmol,32.8% yield) as a white solid.

¹H NMR (400 MHz, CD₃OD) δ=8.54 (d, J=1.71 Hz, 1H), 8.15 (dd, J=8.68,2.08 Hz, 1H), 7.91 (dd, J=8.80, 1.47 Hz, 1H).

Step C: To a solution of 7-bromo-4-(trifluoromethyl)phthalazin-1(2H)-one(200 mg, 683 μmol, 1.00 eq.) in POCl₃ (3.30 g, 21.5 mmol, 2.00 mL, 31.5eq.) was added pyridine (108 mg, 1.37 mmol, 110 μL, 2.00 eq.) at 20° C.The mixture was stirred at 105° C. for 1.5 hours then concentrated underreduced pressure to give 6-bromo-4-chloro-1-(trifluoromethyl)phthalazine(210 mg, crude) as a white solid.

Step D: To a solution of 6-bromo-4-chloro-1-(trifluoromethyl)phthalazine(135 mg, 433 μmol, 1.50 eq.) in DMSO (2.00 mL) was added N,N-diisopropylethylamine (112 mg, 866 μmol, 151 μL, 3.00 eq.), KF (1.68mg, 28.8 μmol, 6.76 μL, 0.10 eq.) and tert-butyl(R)-(2-(5-(1-aminoethyl)thiophen-2-yl)benzyl)(methyl)carbamate (0.10 g,289 μmol, 100 eq.). The mixture was stirred at 130° C. for 45 minutes inthe microwave. The mixture was diluted with water (2.00 mL) andextracted with ethyl acetate (2.00 mL×3). The combined organic layerswere washed with water (2.00 mL×2), dried over anhydrous sodium sulfate,filtered and concentrated under reduced pressure to give a residue. Theresidue was purified by prep-TLC (SiO₂, Petroleum ether:Ethylacetate=5:1) to give tert-butyl(R)-(2-(5-(1-((7-bromo-4-(trifluoromethyl)phthalazin-1-yl)amino)ethyl)thiophen-2-yl)benzyl)(methyl)carbamate(46.0 mg, 74.0 μmol, 25.6% yield) as a yellow oil.

Step E: A mixture of tert-butyl(R)-(2-(5-(1-((7-bromo-4-(trifluoromethyl)phthalazin-1-yl)amino)ethyl)thiophen-2-yl)benzyl)(methyl)carbamate(0.046 g, 74.0 μmol, 1.00 eq.), morpholine (7.74 mg, 88.8 μmol, 7.82 μL,1.20 eq.), Cs₂CO₃ (72.3 mg, 222 μmol, 3.00 eq.), Pd₂(dba)₃ (6.78 mg,7.40 μmol, 0.100 eq.) and RuPhos (6.91 mg, 14.8 μmol, 0.20 eq.) indioxane (0.10 mL) was degassed and purged with nitrogen for 3 times, andthen the mixture was stirred at 110° C. for 1 hour under a nitrogenatmosphere. After this time, the mixture was diluted with water (2.00mL) and extracted with ethyl acetate (2.00 mL×3). The combined organiclayers were washed with brine (2.00 mL×2), dried over anhydrous sodiumsulfate, filtered and concentrated under reduced pressure to give aresidue. The residue was purified by prep-TLC (SiO₂, Petroleumether:Ethyl acetate=3:1) to give tert-butyl(R)-methyl(2-(5-(1-((7-morpholino-4-(trifluoromethyl)phthalazin-1-yl)amino)ethyl)thiophen-2-yl)benzyl)carbamate(43.0 mg, 68.5 μmol, 92.6% yield) as a yellow oil.

Step F: To a solution of tert-butyl(R)-methyl(2-(5-(1-((7-morpholino-4-(trifluoromethyl)phthalazin-1-yl)amino)ethyl)thiophen-2-yl)benzyl)carbamate(50.0 mg, 79.7 μmol, 1.00 eq.) in dichloromethane (1.00 mL) was addedtrifluoroacetic acid (770 mg, 6.75 mmol, 0.50 mL, 84.8 eq.). The mixturewas stirred at 25° C. for 20 minutes, then filtered and concentratedunder reduced pressure to give a residue. The residue was purified byprep-HPLC (Column: Phenomenex Synergi C18 100×21.2 mm×4 um; mobilephase: phase A: [water(0.1% TFA)], phase B: ACN; B %: 17%-47%) to give(R)—N-(1-(5-(2-((methylamino)methyl)phenyl)thiophen-2-yl)ethyl)-7-morpholino-4-(trifluoromethyl)phthalazin-1-amine(17.5 mg, 33.1 μmol, 41.6% yield) as a white solid.

¹H NMR (500 MHz, DMSO-d) δ 8.87 (s, 2H), 8.50 (s, 1H), 7.89-7.39 (m,6H), 7.19 (s, 1H), 7.08 (s, 1H), 6.07-5.96 (m, 1H), 4.23 (s, 2H), 3.80(s, 4H), 3.46 (s, 4H), 2.56 (s, 3H), 1.80 (d, J=6.9 Hz, 3H).

Following the teachings of the General Reaction Scheme III, and theprocedure described for the preparation of Example 10-1 and 10-2, thefollowing compounds of Formula (I), Examples 10-3 to 10-87 shown inTable 10 were prepared.

TABLE 10 Ex. # Structure Spectral Data 10-3 

4-(1-methyl-4-(((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6- yl)piperidin-2-one ¹HNMR (400 MHz, CD₃OD) δ 8.70 (s, 1H), 8.39 (d, J = 8.5 Hz, 1H), 8.17 (dd,J = 8.5, 1.6 Hz, 1H), 7.74 (d, J = 7.9 Hz, 1H), 7.56 (s, 1H), 7.31 (s,1H), 5.63-5.55 (m, 1H), 3.59- 3.49 (m, 2H), 2.89 (s, 3H), 2.77- 2.68 (m,2H), 2.66 (s, 3H), 2.29-2.22 (m, 3H), 1.73 (d, J = 6.9 Hz, 3H). LCMS[M + 1]⁺: 443.2 10-4 

(R)-N-(1-(3-(difluoromethyl)-2-methylphenyl)ethyl)-4-methyl-7-(piperazin-1- yl)phthalazin-1-amine ¹HNMR (400 MHz, CD₃OD) δ = 8.25 (d, J = 9.2 Hz, 1H), 7.96 (s, 1H), 7.83(dd, J = 2.4, 9.2 Hz, 1H), 7.65 (d, J = 8.0 Hz, 1H), 7.40 (br d, J = 7.2Hz, 1H), 7.30-7.20 (m, 1H), 7.13- 6.80 (m, 1H), 5.6 (q, J = 6.8 Hz, 1H),4.17-3.93 (m, 4H), 3.58-3.43 (m, 4H), 2.80 (s, 3H), 2.59 (s, 3H), 1.71(br d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺ = 412.3. 10-5 

(R)-7-(6,6-difluoro-1,4-diazepan-1-yl)-4- methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1- amine ¹H NMR (400 MHz,CD₃OD) δ = 7.89 (d, J = 8.8 Hz, 1H), 7.69 (d, J = 7.6 Hz, 1H), 7.56 (s,1H), 7.53 (dd, J = 4.8, 8.8 Hz, 1H), 7.48 (d, J = 7.6 Hz, 1H), 7.22 (t,J = 8.0 Hz, 1H), 5.71 (br d, J = 6.8 Hz, 1H), 4.27 (dt, J = 2.0, 12.0Hz, 2H), 3.89 (q, J = 4.8 Hz, 2H), 3.13 (t, J = 5.6 Hz, 2H), 3.07 (dt, J= 1.2, 14.8 Hz, 2H), 2.61 (s, 3H), 2.59 (s, 3H), 1.63 (d, J = 6.8 Hz,3H). LCMS [M + 1]⁺: 480.1. 10-6 

4-methyl-N-((R)-1-(2-methyl-3- (trifluoromethyl)phenyl)ethyl)-7-((S)-3-methylmorpholino)phthalazin-1-amine ¹H NMR (400 MHz, CD₃OD) δ = 8.16 (d,J = 10.0 Hz, 1H), 7.74-7.65 (m, 3H), 7.53 (br d, J = 7.8 Hz, 1H), 7.28(s, 1H), 5.53 (d, J = 6.8 Hz, 1H), 5.49 (s, 1H), 4.46-4.36 (m, 1H), 4.12(dd, J = 3.6, 11.2 Hz, 1H), 3.95-3.81 (m, 3H), 3.72 (dt, J = 2.8, 12.0Hz, 1H), 3.51-3.40 (m, 1H), 3.35 (s, 1H), 2.75 (s, 3H), 2.63 (s, 3H),1.66 (d, J = 6.8 Hz, 3H), 1.36 (d, J = 7.2 Hz, 3H). LCMS [M + 1]⁺ =445.2. 10-7 

(R)-4-methyl-N-(1-(2-methyl-3- (trifluoromethyl)phenyl)ethyl)-7-(4-(methylamino)piperidin-1-yl)phthalazin-1- amine ¹H NMR (400 MHz, CD₃OD)δ = 8.16 (d, J = 9.6 Hz, 1H), 7.84 (s, 1H), 7.78-7.71 (m, 2H), 7.52 (d,J = 7.6 Hz, 1H), 7.27 (t, J = 16.0 Hz, 1H), 5.55-5.50 (m, 1H), 4.54 (d,J = 13.6 Hz, 2H), 3.51-3.31 (m, 1H), 3.28- 3.23 (m, 2H), 2.78 (s, 3H),2.75 (s, 3H), 2.62 (s, 3H), 2.31 (d, J = 10.8 Hz, 2H), 1.78-1.72 (m,2H), 1.68 (d, J = 7.6 Hz, 3H). LCMS [M + 1]⁺: 458.2. 10-8 

(R)-7-(4-(dimethylamino)piperidin-1-yl)-4- methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1- amine ¹H NMR (400 MHz,CD₃OD) δ = 8.17 (d, J = 9.6 Hz, 1H), 7.85 (s, 1H), 7.78-7.72 (m, 2H),7.52 (d, J = 8.0 Hz, 1H), 7.27 (t, J = 8.0 Hz, 1H), 5.56-5.50 (m, 1H),4.60 (d, J = 13.2 Hz, 2H), 3.66-3.63 (m, 1H), 3.30- 3.22 (m, 2H), 2.93(s, 6H), 2.75 (s, 3H), 2.32 (d, J = 9.6 Hz, 2H), 1.91-1.85 (m, 2H), 1.68(d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 472.2. 10-9 

(R)-7-(4-amino-4-methylpiperidin-1-yl)-4- methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1- amine ¹H NMR (400 MHz,CD₃OD) δ 8.17 (d, J = 9.3 Hz, 1H), 7.85 (s, 1H), 7.79-7.71 (m, 2H), 7.53(d, J = 7.8 Hz, 1H), 7.27 (t, J = 7.8 Hz, 1H), 5.54 (q, J = 6.9 Hz, 1H),4.21 (d, J = 14.1 Hz, 2H), 3.58 (dd, J = 14.1, 6.9 Hz, 2H), 2.75 (s,3H), 2.63 (s, 3H), 2.05-1.97 (m, 4H), 1.68 (d, J = 6.9 Hz, 3H), 1.57 (s,3H). LCMS [M + 1]⁺: 458.2. 10-10

(R)-4-methyl-7-(4-(1-methyl-1H-pyrazol-4-yl)piperazin-1-yl)-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1- amine ¹H NMR (400 MHz, DMSO-d₆) δ 14.83 (s, 1H), 8.76 (s, 1H), 8.16 (d, J = 9.3 Hz, 1H), 8.03 (s,1H), 7.85-7.79 (m, 2H), 7.56 (d, J = 7.1 Hz, 2H), 7.36 (dd, J = 16.0,8.2 Hz, 2H), 5.48 (q, J = 6.9 Hz, 1H), 3.92 (s, 4H), 3.78 (s, 3H), 3.17(s, 5H), 2.73 (s, 3H), 2.59-2.56 (m, 3H), 1.64 (d, J = 6.9 Hz, 3H). LCMS[M + 1]⁺: 510.2 10-11

(R)-7-(1,3-dimethyl-5,6-dihydroimidazo[1,5-a]pyrazin-7(8H)-yl)-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1- amine ¹H NMR (400 MHz,CD₃OD) δ 8.30 (d, J = 9.3 Hz, 1H), 8.02 (d, J = 2.4 Hz, 1H), 7.92 (dd, J= 9.3, 2.5 Hz, 1H), 7.83 (d, J = 7.9 Hz, 1H), 7.57 (d, J = 7.8 Hz, 1H),7.31 (t, J = 7.9 Hz, 1H), 5.61 (q, J = 6.9 Hz, 1H), 5.02 (d, J = 2.5 Hz,2H), 4.43 (t, J = 5.4 Hz, 2H), 4.30 (t, J = 5.4 Hz, 2H), 2.83 (s, 3H),2.69- 2.65 (m, 6H), 2.43 (s, 3H), 1.76 (d, J = 7.0 Hz, 3H). LCMS [M +1]⁺: 495.2. 10-12

(R)-2-(1-methyl-4-(((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6-yl)hexahydropyrrolo[1,2-a]pyrazin-6(2H)-one ¹H NMR (400 MHz, DMSO- d₆)δ = 7.80 (d, J = 8.8 Hz, 1H), 7.75 (d, J = 7.6 Hz, 1H), 7.65-7.63 (m,2H), 7.50 (d, J = 7.6 Hz, 1H), 7.36 (d, J = 6.8 Hz, 1H), 7.30 (t, J =8.0 Hz, 1H), 5.70- 5.66 (m, 1H), 4.24-4.23 (m, 1H), 4.12-3.96 (m, 1H),3.94-3.93 (m, 1H), 3.72- 3.71 (m, 1H), 3.09-3.20 (m, 1H), 2.91-3.02 (m,1H), 2.60-2.71 (m, 1H), 2.57 (s, 3H), 2.52 (s, 3H), 2.32-2.28 (m, 2H),2.26-2.14 (m, 1H), 1.70-1.68 (m, 1H), 1.55 (d, J = 6.8 Hz, 3H). LCMS[M + 1]⁺: 484.1. 10-13

(S)-2-(1-methyl-4-(((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6-yl)hexahydropyrrolo[1,2-a]pyrazin-6(2H)-one ¹H NMR (400 MHz, DMSO- d₆)δ = 7.80 (d, J = 8.8 Hz, 1H), 7.73 (d, J = 8.0 Hz, 1H), 7.64-7.60 (m,2H), 7.50 (d, J = 7.6 Hz, 1H), 7.29 (t, J = 8.0 Hz, 1H), 5.68- 5.63 (m,1H), 4.22 (d, J = 10.4 Hz, 1H), 4.13 (d, J = 12.4 Hz, 1H), 4.09-3.95 (m,1H), 3.72-3.71 (m, 1H), 2.97 (t, J = 9.2 Hz, 1H), 2.81 (t, J = 12.0 Hz,1H), 2.67- 2.61 (m, 1H), 2.56 (s, 3H), 2.51 (s, 3H), 2.32-2.29 (m, 2H),2.26-2.14 (m, 1H), 1.70-1.68 (m, 1H), 1.53 (d, J = 7.2 Hz, 3H). LCMS[M + 1]⁺: 484.1. 10-14

(R)-7-(3,5-dimethyl-1H-pyrazol-1-yl)-4-methyl- N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1- amine ¹H NMR (400 MHz, DMSO-d₆) δ = 9.01 (brs, 1H), 8.95 (s, 1H), 8.47 (d, J = 8.8 Hz, 1H), 8.31 (d,J = 8.0 Hz, 1H), 7.77 (d, J = 7.6 Hz, 1H), 7.58 (d, J = 8.0 Hz, 1H),7.37 (m, 1H), 6.3 (s, 1H), 5.51 (m, 1H), 2.84 (s, 3H), 2.58 (s, 3H),2.49 (s, 3H), 2.28 (s, 3H), 1.63 (d, J = 6.8 Hz, 3H). LCMS [M + H]⁺:440.6. 10-15

(R)-7-(5,6-dihydropyrrolo[3,4-c]pyrazol-1(4H)-yl)-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1- amine ¹H NMR (400 MHz, DMSO-d₆) δ = 8.77-8.71 (m, 1H), 8.13-8.08 (m, 1H), 8.03- 7.98 (m, 1H), 7.93(br d, J = 6.4 Hz, 1H), 7.79 (d, J = 8.0 Hz, 1H), 7.70 (s, 1H), 7.51 (d,J = 7.6 Hz, 1H), 7.30 (t, J = 6.8 Hz, 1H), 5.74-5.63 (m, 1H), 4.66-4.52(m, 2H), 4.15- 4.05 (m, 2H), 2.64 (s, 3H), 2.59 (br s, 3H), 1.56 (d, J =6.8 Hz, 3H). LCMS [M + 1]⁺: 453.3. 10-16

(R)-7-(5,6-dihydropyrrolo[3,4-c]pyrazol-2(4H)-yl)-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1- amine ¹H NMR (400 MHz,CD₃OD) δ = 8.75 (d, J = 2.0 Hz, 1H), 8.42-8.34 (m, 2H), 8.17 (d, J = 8.8Hz, 1H), 7.75 (d, J = 8.0 Hz, 1H), 7.50 (d, J = 7.6 Hz, 1H), 7.25 (t, J= 8.0 Hz, 1H), 5.74 (q, J = 6.8 Hz, 1H), 4.42 (d, J = 7.2 Hz, 4H), 2.71(s, 3H), 2.64 (s, 3H), 1.66 (d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 453.4.10-17

(R)-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(1H-pyrazol-1- yl)phthalazin-1-amine ¹HNMR (400 MHz, DMSO- d₆) δ = 9.20 (s, 1H), 8.98 (br s, 1H), 8.87 (d, J =2.8 Hz, 1H), 8.65 (dd, J = 9.2 Hz, J = 2.0 Hz 1H), 8.51 (d, J = 8.8 Hz,1H), 8.03 (d, J = 1.6 Hz, 1H), 7.81 (d, J = 7.6 Hz, 1H), 7.59 (d, J =7.6 Hz, 1H), 7.38 (m, 1H), 6.81 (m, 1H), 5.52 (m, 1H), 2.83 (s, 3H),2.59 (s, 3H), 1.66 (d, J = 6.8 Hz, 3H). LCMS [M + H]⁺: 412.3. 10-18

(R)-4-methyl-N-(1-(2-methyl-3- (trifluoromethyl)phenyl)ethyl)-7-(1,8-diazaspiro[4.5]decan-8-yl)phthalazin-1-amine ¹H NMR (400 MHz, CD₃OD) δ =8.18 (d, J = 9.2 Hz, 1H), 7.89 (d, J = 2.4 Hz, 1H), 7.82-7.74 (m, 2H),7.54 (d, J = 8.0 Hz, 1H), 7.29 (t, J = 7.6 Hz, 1H), 5.55 (q, J = 7.2 Hz,1H), 4.28- 4.16 (m, 2H), 3.70-3.57 (m, 2H), 3.47 (t, J = 6.8 Hz, 2H),2.77 (s, 3H), 2.65 (s, 3H), 2.32-2.17 (m, 4H), 2.17- 2.06 (m, 4H), 1.71(d, J = 7.2 Hz, 3H). LCMS [M + 1]⁺: 484.2. 10-19

(R)-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(1-methyl-1,8-diazaspiro[4.5]decan-8-yl)phthalazin-1-amine ¹H NMR (400 MHz, CD₃OD) δ =8.19 (d, J = 9.2 Hz, 1H), 7.91 (d, J = 2.0 Hz, 1H), 7.84-7.74 (m, 2H),7.54 (d, J = 8.0 Hz, 1H), 7.29 (t, J = 7.6 Hz, 1H), 5.56 (q, J = 6.8 Hz,1H), 4.62- 4.50 (m, 2H), 3.83-3.71 (m, 1H), 3.42-3.33 (m, 3H), 2.85 (s,3H), 2.77 (s, 3H), 2.65 (s, 3H), 2.62-2.53 (m, 1H), 2.35-2.14 (m, 4H),2.13-1.93 (m, 3H), 1.71 (d, J = 7.2 Hz, 3H). LCMS [M + 1]⁺: 498.3. 10-20

(R)-N-(1-(2,4-dichlorophenyl)ethyl)-4-methyl-7-morpholinophthalazin-1-amine ¹H NMR (400 MHz, DMSO- d₆) δ = 7.82 (d, J= 9.2 Hz, 1H), 7.63-7.62 (m, 1H), 7.57-7.56 (m, 2H), 7.44 (d, J = 8.0Hz, 1H), 7.41-7.39 (m, 1H), 7.32-7.31 (m, 1H), 5.64-5.60 (m, 1H), 3.82(t, J = 4.8 Hz, 4H), 3.41 (t, J = 4.4 Hz, 4H), 2.52 (s, 3H), 1.55 (d, J= 7.2 Hz, 3H). LCMS [M + 1]⁺: 417.0. 10-21

(R)-N-(1-(2,4-dichlorophenyl)ethyl)-4-methyl-7-(piperazin-1-yl)phthalazin-1-amine ¹H NMR (400 MHz, DMSO- d₆) δ =14.96 (s, 1H), 9.60 (s, 2H), 9.05 (s, 1H), 8.22-8.21 (m, 2H), 7.82-7.77(m, 1H), 7.65 (d, J = 8.4 Hz, 1H), 7.60 (d, J = 2.4 Hz, 1H), 7.37 (dd, J= 2.0 Hz, 8.4 Hz, 1H), 5.50-5.43 (m, 1H), 4.07-3.98 (m, 4H), 3.33- 3.28(m, 4H), 2.74 (s, 3H), 1.66 (d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 416.1.10-22

7-(6-fluoro-1,4-diazepan-1-yl)-4-methyl-N-((R)- 1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1- amine ¹H NMR (400 MHz, DMSO-d₆) δ = 7.88 (d, J = 9.2 Hz, 1H), 7.69 (d, J = 7.6 Hz, 1H), 7.51-7.47(m, 3H), 7.22 (t, J = 8.0 Hz, 1H), 5.71- 5.68 (m, 1H), 5.14-4.94 (m,1H), 4.13-4.07 (m, 2H), 3.85-3.83 (m, 2H), 3.30- 2.99 (m, 4H), 2.61-2.55(m, 6H), 1.61 (d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 462.2. 10-23

(R)-4-(1-methyl-4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin- 6-yl)thiomorpholine1,1-dioxide ¹H NMR (400 MHz, CD₃OD) δ = 7.95 (d, J = 8.8 Hz, 1H),7.73-7.68 (m, 2H), 7.64 (dd, J = 2.4, 8.8 Hz, 1H), 7.48 (d, J = 7.6 Hz,1H), 7.23 (t, J = 7.6 Hz, 1H), 5.72 (q, J = 6.8 Hz, 1H), 4.20-4.11 (m,4H), 3.25- 3.17 (m, 4H), 2.61 (s, 6H), 1.63 (d, J = 7.2 Hz, 3H). LCMS[M + 1]⁺: 479.2. 10-24

4-methyl-N-((R)-1-(2-methyl-3- (trifluoromethyl)phenyl)ethyl)-7-(((S)-1-methylpyrrolidin-2-yl)methoxy)phthalazin-1-amine hydrochloride salt ¹HNMR (400 MHz, CD₃OD) δ = 8.40-8.36 (m, 2H), 7.88- 7.77 (m, 2H), 7.54 (d,J = 8.0 Hz, 1H), 7.28 (t, J = 8.0 Hz, 1H), 5.58 (q, J = 6.8 Hz, 1H),4.69 (br dd, J = 7.2, 11.2 Hz, 2H), 4.08 (br d, J = 3.6 Hz, 1H), 3.81(br s, 1H), 3.15 (s, 3H), 2.86 (s, 3H), 2.64 (s, 3H), 2.51 (br dd, J =6.0, 12.4 Hz, 1H), 2.45-2.04 (m, 4H), 1.73 (d, J = 6.8 Hz, 3H). LCMS[M + 1]⁺: 459.2. 10-25

4-methyl-N-((R)-1-(2-methyl-3- (trifluoromethyl)phenyl)ethyl)-7-(((R)-1-methylpyrrolidin-2-yl)methoxy)phthalazin-1-amine hydrochloride salt ¹HNMR (400 MHz, CD₃OD) δ = 8.48-8.29 (m, 2H), 7.89- 7.79 (m, 2H), 7.56 (brd, J = 7.6 Hz, 1H), 7.30 (br t, J = 8.0 Hz, 1H), 5.63-5.54 (m, 1H),4.85-4.67 (m, 3H), 4.15-4.05 (m, 1H), 3.89-3.79 (m, 1H), 3.17 (s, 3H),2.88 (s, 3H), 2.66 (s, 3H), 2.60-2.44 (m, 1H), 2.36-2.10 (m, 3H), 1.74(br d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 459.2. 10-26

7-((R)-3-(dimethylamino)pyrrolidin-1-yl)-4-methyl- N-((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine hydrochloride salt ¹HNMR (400 MHz, CD₃OD) δ = 8.22 (d, J = 9.2 Hz, 1H), 7.79 (d, J = 7.6 Hz,1H), 7.60 (d, J = 2.0 Hz, 1H), 7.54 (d, J = 8.0 Hz, 1H), 7.49 (dd, J =2.4, 9.2 Hz, 1H), 7.29 (t, J = 8.0 Hz, 1H), 5.57 (q, J = 6.8 Hz, 1H),4.26-4.17 (m, 2H), 4.06-3.96 (m, 1H), 3.95-3.85 (m, 1H), 3.78-3.67 (m,1H), 3.09 (br d, J = 10.4 Hz, 6H), 2.78 (s, 3H), 2.77-2.70 (m, 1H), 2.65(s, 3H), 2.47 (qd, J = 8.4, 12.4 Hz, 1H), 1.72 (d, J = 6.8 Hz, 3H). LCMS[M + 1]⁺: 458.2. 10-27

7-((R)-3-(dimethylamino)pyrrolidin-1-yl)-4-methyl- N-((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine hydrochloride salt ¹HNMR (400 MHz, CD₃OD) δ = 8.20 (d, J = 9.2 Hz, 1H), 7.77 (d, J = 7.6 Hz,1H), 7.59 (d, J = 1.6 Hz, 1H), 7.52 (br d, J = 8.0 Hz, 1H), 7.47 (dd, J= 2.4, 9.2 Hz, 1H), 7.27 (t, J = 7.6 Hz, 1H), 5.55 (q, J = 6.8 Hz, 1H),4.27-4.12 (m, 2H), 4.01-3.88 (m, 2H), 3.77-3.67 (m, 1H), 3.07 (br s,6H), 2.76 (s, 3H), 2.74-2.69 (m, 1H), 2.63 (s, 3H), 2.46 (qd, J = 8.8,12.8 Hz, 1H), 1.70 (d, J = 7.2 Hz, 3H). LCMS [M + 1]⁺: 458.3. 10-28

4-methyl-N-((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(3-methyl-3,8-diazabicyclo[3.2.1]octan-8-yl)phthalazin-1-amine hydrochloride salt ¹HNMR (400 MHz, CD₃OD) δ = 8.25 (d, J = 9.2 Hz, 1H), 7.94 (d, J = 2.4 Hz,1H), 7.80 (d, J = 8.0 Hz, 1H), 7.74 (dd, J = 2.4, 9.2 Hz, 1H), 7.54 (d,J = 7.6 Hz, 1H), 7.29 (t, J = 7.6 Hz, 1H), 5.56 (q, J = 6.8 Hz, 1H),5.07 (br s, 2H), 3.60 (br d, J = 12.8 Hz, 2H), 3.40-3.34 (m, 2H), 2.87(s, 3H), 2.79 (s, 3H), 2.65 (s, 3H), 2.47-2.24 (m, 4H), 1.72 (d, J = 6.8Hz, 3H). LCMS [M + 1]⁺: 470.2. 10-29

4-methyl-N-((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(8-methyl-3,8-diazabicyclo[3.2.1]octan-3-yl)phthalazin-1-amine hydrochloride salt ¹HNMR (400 MHz, CD₃OD): δ = 8.28-8.21 (m, 1H), 7.94- 7.90 (m, 1H),7.81-7.73 (m, 2H), 7.55-7.50 (m, 1H), 7.31- 7.24 (m, 1H), 5.60-5.51 (m,1H), 4.43-4.32 (m, 2H), 4.28- 4.21 (m, 2H), 3.84-3.58 (m, 2H), 3.01-2.91(m, 3H), 2.83- 2.76 (m, 3H), 2.65-2.60 (m, 3H), 2.49-2.33 (m, 2H), 2.25-2.12 (m, 2H), 1.74-1.66 (m, 3H). LCMS [M + 1]⁺: 470.3. 10-30

(R)-7-(4-(azetidin-1-yl)piperidin-1-yl)-4-methyl-N- (1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine hydrochloride salt ¹HNMR (400 MHz, CD₃OD) δ = 8.17 (d, J = 9.6 Hz, 1H), 7.86 (d, J = 2.4 Hz,1H), 7.81-7.72 (m, 2H), 7.54 (d, J = 7.6 Hz, 1H), 7.34-7.25 (m, 1H),5.55 (q, J = 7.2 Hz, 1H), 4.54 (br d, J = 13.6 Hz, 2H), 4.39-4.13 (m,4H), 3.65 (tt, J = 4.0, 11.2 Hz, 1H), 3.27 (br t, J = 12.4 Hz, 2H), 2.77(s, 3H), 2.65 (s, 4H), 2.54-2.34 (m, 1H), 2.24 (br d, J = 11.6 Hz, 2H),1.70 (d, J = 6.8 Hz, 3H), 1.67-1.52 (m, 2H). LCMS [M + 1]⁺: 484.3. 10-31

4-methyl-N-((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-((1S,4S)-5-methyl-2,5-diazabicyclo[2.2.2]octan-2-yl)phthalazin-1- amine ¹H NMR (400 MHz,CD₃OD) δ = 8.04 (d, J = 9.2 Hz, 1H), 7.70 (d, J = 8.0 Hz, 1H), 7.51 (d,J = 7.6 Hz, 1H), 7.48-7.42 (m, 2H), 7.26 (t, J = 8.0 Hz, 1H), 5.57 (q, J= 6.8 Hz, 1H), 4.44 (br s, 1H), 4.02 (td, J = 2.4, 11.6 Hz, 1H), 3.52(dd, J = 2.0, 11.6 Hz, 1H), 3.16-3.02 (m, 3H), 2.68 (s, 3H), 2.62 (s,3H), 2.54 (s, 3H), 2.33-2.20 (m, 1H), 2.13-1.92 (m, 2H), 1.84- 1.73 (m,1H), 1.65 (d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 470.2. 10-32

4-methyl-N-((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-((1R,4R)-5-methyl-2,5-diazabicyclo[2.2.2]octan-2-yl)phthalazin-1- amine ¹H NMR (400 MHz,CD₃OD) δ = 7.85 (d, J = 8.8 Hz, 1H), 7.70 (d, J = 7.6 Hz, 1H), 7.47 (d,J = 7.6 Hz, 1H), 7.33 (dd, J = 2.4, 8.8 Hz, 1H), 7.28 (d, J = 2.4 Hz,1H), 7.22 (t, J = 8.0 Hz, 1H), 5.71 (q, J = 6.8 Hz, 1H), 4.30 (br s,1H), 3.96 (td, J = 2.4, 10.8 Hz, 1H), 3.43 (dd, J = 2.0, 10.8 Hz, 1H),3.11-2.94 (m, 3H), 2.61 (s, 3H), 2.57 (s, 3H), 2.49 (s, 3H), 2.28-2.16(m, 1H), 2.10-1.99 (m, 1H), 1.97-1.87 (m, 1H), 1.81-1.69 (m, 1H), 1.62(d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 470.2. 10-33

(R)-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(4-methyl-4,7-diazaspiro[2.5]octan-7-yl)phthalazin-1-amine ¹H NMR (400 MHz, CD₃OD) δ =7.88 (d, J = 8.8 Hz, 1H), 7.69 (d, J = 7.6 Hz, 1H), 7.58-7.52 (m, 2H),7.47 (d, J = 7.6 Hz, 1H), 7.22 (t, J = 8.0 Hz, 1H), 5.72 (q, J = 6.8 Hz,1H), 3.54 (dd, J = 4.8, 6.8 Hz, 2H), 3.35 (s, 2H), 3.18-3.11 (m, 2H),2.64-2.57 (m, 6H), 2.48 (s, 3H), 1.62 (d, J = 6.8 Hz, 3H), 0.86-0.80 (m,2H), 0.73-0.64 (m, 2H). LCMS [M + 1]⁺: 470.3. 10-34

(R)-4-methyl-N-(1-(2-methyl-3- (trifluoromethyl)phenyl)ethyl)-7-(4,7-diazaspiro[2.5]octan-7-yl)phthalazin-1-amine ¹H NMR (400 MHz, DMSO- d₆)δ = 8.46 (br s, 1H), 8.06 (d, J = 9.2 Hz, 1H), 7.90 (br s, 1H), 7.81 (brd, J = 7.6 Hz, 1H), 7.72 (br d, J = 8.0 Hz, 1H), 7.54 (d, J = 7.6 Hz,1H), 7.34 (br t, J = 8.0 Hz, 1H), 5.51 (br t, J = 6.8 Hz, 1H), 3.84 (brd, J = 4.8 Hz, 2H), 3.73 (br s, 2H), 3.25 (br s, 2H), 2.67 (s, 3H), 2.57(s, 3H), 1.62 (br d, J = 6.8 Hz, 3H), 0.95-0.79 (m, 4H). LCMS [M + 1]⁺:456.2. 10-35

(R)-4-methyl-N-(1-(2-methyl-3- (trifluoromethyl)phenyl)ethyl)-7-(1,8-diazaspiro[4.5]decan-8-yl)phthalazin-1-amine ¹H NMR (400 MHz, CD₃OD) δ =8.18 (d, J = 9.2 Hz, 1H), 7.89 (d, J = 2.4 Hz, 1H), 7.82-7.74 (m, 2H),7.54 (d, J = 8.0 Hz, 1H), 7.29 (t, J = 7.6 Hz, 1H), 5.55 (q, J = 7.2 Hz,1H), 4.28- 4.16 (m, 2H), 3.70-3.57 (m, 2H), 3.47 (t, J = 6.8 Hz, 2H),2.77 (s, 3H), 2.65 (s, 3H), 2.32- 2.17 (m, 4H), 2.17-2.06 (m, 4H), 1.71(d, J = 7.2 Hz, 3H). LCMS [M + 1]⁺: 484.2. 10-36

(R)-4-methyl-N-(1-(2-methyl-3- (trifluoromethyl)phenyl)ethyl)-7-(2,8-diazaspiro[4.5]decan-8-yl)phthalazin-1-amine hydrochloride salt ¹H NMR(400 MHz, CD₃OD) δ = 8.15 (d, J = 9.6 Hz, 1H), 7.83 (d, J = 2.4 Hz, 1H),7.78-7.71 (m, 2H), 7.54 (d, J = 7.6 Hz, 1H), 7.29 (t, J = 8.0 Hz, 1H),5.55 (q, J = 6.8 Hz, 1H), 3.95- 3.75 (m, 4H), 3.50 (t, J = 7.2 Hz, 2H),3.28 (s, 2H), 2.76 (s, 3H), 2.65 (s, 3H), 2.15-2.08 (m, 2H), 1.96-1.83(m, 4H), 1.70 (d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 484.2. 10-37

(R)-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(2-methyl-2,8-diazaspiro[4.5]decan-8-yl)phthalazin-1-amine hydrochloride salt ¹H NMR(400 MHz, CD₃OD) δ = 8.15 (d, J = 9.2 Hz, 1H), 7.81 (d, J = 2.0 Hz, 1H),7.77-7.69 (m, 2H), 7.54 (d, J = 7.6 Hz, 1H), 7.29 (t, J = 8.0 Hz, 1H),5.55 (q, J = 6.8 Hz, 1H), 3.94- 3.70 (m, 6H), 3.31-3.24 (m, 1H), 3.08(d, J = 11.6 Hz, 1H), 3.01 (s, 3H), 2.76 (s, 3H), 2.64 (s, 3H),2.33-2.21 (m, 1H), 2.17-2.08 (m, 1H), 2.01-1.87 (m, 4H), 1.69 (d, J =6.8 Hz, 3H). LCMS [M + 1]⁺: 498.3. 10-38

(R)-8-(1-methyl-4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6-yl)-2,8-diazaspiro[4.5]decan-1-one ¹H NMR (400 MHz, DMSO- d₆) δ =7.81-7.74 (m, 2H), 7.63- 7.58 (m, 3H), 7.50 (d, J = 7.6 Hz, 1H),7.55-7.44 (m, 1H), 7.32-7.29 (m, 1H), 5.68-5.64 (m, 1H), 4.05-4.01 (m,2H), 3.21-3.23 (m, 1H), 3.08-3.13 (m, 3H), 2.57 (s, 3H), 2.53 (s, 3H),2.06 (t, J = 6.8 Hz, 2H), 1.85-1.78 (m, 2H), 1.55 (d, J = 6.8 Hz, 3H),1.50-1.52 (m, 2H). LCMS [M + 1]⁺: 498.6. 10-39

(R)-2-(1-methyl-4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6-yl)-2,8-diazaspiro[4.5]decan-1-one hydrochloride salt ¹H NMR (400 MHz,DMSO- d₆) δ = 9.40 (br s, 1H), 9.17 (br s, 1H), 9.08-8.94 (m, 1H), 8.89(dd, J = 1.2, 8.8 Hz, 1H), 8.70 (s, 1H), 8.39 (d, J = 9.2 Hz, 1H), 7.92(d, J = 8.0 Hz, 1H), 7.54 (d, J = 7.6 Hz, 1H), 7.33 (t, J = 8.0 Hz, 1H),5.50 (q, J = 6.4 Hz, 1H), 4.29-4.19 (m, 1H), 4.15-4.09 (m, 1H),3.36-3.27 (m, 2H), 3.12-3.01 (m, 2H), 2.82 (s, 3H), 2.57 (s, 3H), 2.26(br t, J = 6.8 Hz, 2H), 2.10-1.98 (m, 2H), 1.83 (br d, J = 12.8 Hz, 2H),1.66 (d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 498.3. 10-40

(R)-2-methyl-8-(1-methyl-4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6-yl)-2,8-diazaspiro[4.5]decan-1-one ¹H NMR (400 MHz, CD₃OD) δ = 8.12 (brd, J = 9.2 Hz, 1H), 7.81-7.64 (m, 3H), 7.52 (br d, J = 7.6 Hz, 1H), 7.27(br t, J = 7.6 Hz, 1H), 5.52 (q, J = 6.8 Hz, 1H), 4.31 (br d, J = 13.6Hz, 2H), 3.55-3.39 (m, 4H), 2.88 (s, 3H), 2.73 (s, 3H), 2.63 (s, 3H),2.20 (br t, J = 6.8 Hz, 2H), 1.98 (br t, J = 12.8 Hz, 2H), 1.66 (br d, J= 7.2 Hz, 5H). LCMS [M + 1]⁺: 512.2. 10-41

(R)-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(6-methyl-2,6-diazaspiro[3.4]octan-2-yl)phthalazin-1-amine hydrochloride salt ¹H NMR(400 MHz, CD₃OD) δ = 8.14 (d, J = 9.2 Hz, 1H), 7.71 (d, J = 8.0 Hz, 1H),7.55-7.49 (m, 1H), 7.55-7.47 (m, 1H), 7.43-7.40 (m, 1H), 7.43-7.38 (m,1H), 7.27 (t, J = 7.6 Hz, 1H), 7.18 (d, J = 2.0, 8.8 Hz, 1H), 5.52 (q, J= 7.2 Hz, 1H), 4.44-4.32 (m, 2H), 4.32-4.23 (m, 1H), 4.19-4.04 (m, 1H),3.85-3.69 (m, 1H), 3.52-3.43 (m, 1H), 3.01 (s, 2H), 2.77- 2.71 (m, 3H),2.70-2.59 (m, 4H), 2.57-2.49 (m, 1H), 2.57- 2.49 (m, 1H), 1.73-1.63 (m,3H). LCMS [M + 1]⁺: 470.2. 10-42

(R)-7-(4-(dimethylamino)-4-methylpiperidin-1-yl)-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine hydrochloride salt ¹HNMR (400 MHz, CD₃OD) δ = 8.17 (d, J = 9.2 Hz, 1H), 7.87 (d, J = 2.8 Hz,1H), 7.78-7.73 (m, 2H), 7.52 (d, J = 7.6 Hz, 1H), 7.27 (t, J = 8.0 Hz,1H), 5.54 (q, J = 6.8 Hz, 1H), 4.50- 4.42 (m, 2H), 3.42-3.34 (m, 2H),2.88 (s, 6H), 2.75 (s, 3H), 2.63 (s, 3H), 2.24-2.15 (m, 2H), 2.12-2.01(m, 2H), 1.69 (d, J = 6.8 Hz, 3H), 1.57 (s, 3H). LCMS [M + 1]⁺: 486.3.10-43

(R)-4-methyl-N-(1-(naphthalen-1-yl)ethyl)-7-(piperazin-1-yl)phthalazin-1-amine formate salt ¹H NMR (400 MHz, CD₃OD)δ = 8.49 (s, 1H), 8.19 (d, J = 8.0 Hz, 1H), 8.10 (d, J = 9.2 Hz, 1H),7.92-7.83 (m, 1H), 7.78- 7.73 (m, 2H), 7.71-7.67 (m, 1H), 7.63 (d, J =7.2 Hz, 1H), 7.53-7.44 (m, 2H), 7.43-7.37 (m, 1H), 6.23-6.09 (m, 1H),3.79-3.69 (m, 4H), 3.27-3.19 (m, 4H), 2.71 (s, 3H), 1.82 (d, J = 6.8 Hz,3H). LCMS [M + 1]⁺: 398.2. 10-44

(R)-7-(4-(azetidin-1-yl)piperidin-1-yl)-N-(1-(3-(difluoromethyl)-2-methylphenyl)ethyl)-4- methylphthalazin-1-aminehydrochloride salt ¹H NMR (400 MHz, DMSO- d₆) δ = 8.69-8.52 (m, 1H),8.11 (br d, J = 9.2 Hz, 1H), 7.95 (br s, 1H), 7.76 (br d, J = 9.6 Hz,1H), 7.67 (br s, 1H), 7.40 (br d, J = 7.6 Hz, 1H), 7.36-7.07 (m, 2H),5.45 (br t, J = 6.8 Hz, 1H), 4.49 (br d, J = 13.2 Hz, 2H), 4.18-3.93 (m,4H), 3.55-3.48 (m, 1H), 3.19- 3.10 (m, 2H), 2.70 (s, 3H), 2.51- 2.51 (m,3H), 2.40-2.15 (m, 2H), 2.07-2.02 (m, 2H), 1.62 (d, J = 7.2 Hz, 3H),1.56-1.41 (m, 2H). LCMS [M + 1]⁺: 466.2. 10-45

(R)-N⁷,N⁷,4-trimethyl-N¹-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazine-1,7- diamine ¹H NMR (400 MHz,CD₃OD) δ = 8.12 (d, J = 8.8 Hz, 1H), 7.70 (d, J = 8.0 Hz, 1H), 7.57-7.44(m, 3H), 7.27 (t, J = 8.0 Hz, 1H), 5.53 (q, J = 6.8 Hz, 1H), 3.34-3.32(m, 6H), 2.80-2.71 (s, 3H), 2.63 (s, 3H), 1.67 (d, J = 7.2 Hz, 3H). LCMS[M + 1]⁺: 389.2. 10-46

(R)-7-(3-(dimethylamino)azetidin-1-yl)-4-methyl-N- (1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine formate salt ¹H NMR(400 MHz, CDCl₃) δ = 8.56 (s, 1H), 7.92 (d, J = 8.8 Hz, 1H), 7.70 (d, J= 7.6 Hz, 1H), 7.49 (d, J = 7.6 Hz, 1H), 7.28-7.24 (m, 1H), 7.22 (d, J =2.4 Hz, 1H), 7.11-7.03 (m, 1H), 5.68-5.55 (m, 1H), 4.25 (t, J = 8.0 Hz,2H), 4.02-3.89 (m, 2H), 3.48-3.37 (m, 1H), 2.62 (s, 3H), 2.61 (s, 3H),2.29 (s, 6H), 1.63 (d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 444.1. 10-47

(R)-3-methyl-1-(1-methyl-4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6- yl)azetidin-3-ol ¹HNMR (400 MHz, CD₃OD) δ = 7.83 (d, J = 8.8 Hz, 1H), 7.69 (d, J = 7.6 Hz,1H), 7.47 (d, J = 7.6 Hz, 1H), 7.22 (t, J = 7.6 Hz, 1H), 7.15 (d, J =2.0 Hz, 1H), 7.02 (dd, J = 2.4, 8.8 Hz, 1H), 5.70 (q, J = 6.8 Hz, 1H),4.03 (dd, J = 4.0, 8.0 Hz, 2H), 3.94 (d, J = 8.0 Hz, 2H), 2.61 (s, 3H),2.57 (s, 3H), 1.63-1.59 (m, 6H). LCMS [M + 1]⁺: 431.3. 10-48

(R)-1-(1-methyl-4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6- yl)azetidin-3-ol ¹HNMR (400 MHz, DMSO- d₆) δ = 14.61 (br s, 1H), 8.44 (br d, J = 6.4 Hz,1H), 8.09 (d, J = 8.8 Hz, 1H), 7.77 (d, J = 8.0 Hz, 1H), 7.55 (d, J =8.0 Hz, 1H), 7.46 (s, 1H), 7.34 (t, J = 7.6 Hz, 1H), 7.13 (dd, J = 2.0,9.2 Hz, 1H), 5.96 (d, J = 6.0 Hz, 1H), 5.43 (br t, J = 6.8 Hz, 1H),4.76-4.66 (m, 1H), 4.49-4.39 (m, 2H), 4.00-3.90 (m, 2H), 2.69 (s, 3H),2.56 (s, 3H), 1.61 (d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 417.1. 10-49

(R)-7-(4-(3,3-difluoropyrrolidin-1-yl)piperidin-1-yl)-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine Formate salt ¹H NMR(400 MHz, DMSO- d₆) δ = 8.16 (s, 1H), 7.80-7.74 (m, 2H), 7.62-7.54 (m,2H), 7.51 (d, J = 7.6 Hz, 1H), 7.42 (d, J = 6.4 Hz, 1H), 7.31 (t, J =7.6 Hz, 1H), 5.71-5.62 (m, 1H), 4.02-3.98 (m, 2H), 3.04- 2.96 (m, 5H),2.80 (t, J = 7.2 Hz, 2H), 2.58 (s, 3H), 2.43- 2.39 (m, 2H), 2.37-2.17(m, 3H), 2.03-1.90 (m, 2H), 1.55 (d, J = 7.2 Hz, 3H), 1.54-1.45 (m, 2H).LCMS [M + 1]⁺: 534.4. 10-50

(R)-N-(1-(3-fluoro-5-(trifluoromethyl)phenyl)ethyl)-4-methyl-7-morpholinophthalazin-1-amine ¹H NMR (400 MHz, DMSO- d₆) δ =7.84 (d, J = 8.8 Hz, 1H), 7.64 (s, 1H), 7.55-7.62 (m, 3H), 7.48 (d, J =10.4 Hz, 1H), 7.36 (d, J = 7.6 Hz, 1H), 5.50-5.54 (m, 1H), 3.84-3.82 (m,4H), 3.42-3.44 (m, 4H), 2.55 (s, 3H), 1.61 (d, J = 7.2 Hz, 3H). LCMS[M + 1]⁺: 435.2. 10-51

(R)-2-methyl-3-(1-((4-methyl-7-morpholinophthalazin-1-yl)amino)ethyl)benzonitrile ¹H NMR (400 MHz,CD₃OD) δ = 7.86 (d, J = 8.8 Hz, 1H), 7.77- 7.68 (m, 1H), 7.58-7.52 (m,2H), 7.46 (dd, J = 1.2, 7.6 Hz, 1H), 7.22 (t, J = 8.0 Hz, 1H), 5.61 (q,J = 7.2 Hz, 1H), 3.92- 3.84 (m, 4H), 3.49-3.41 (m, 4H), 2.72 (s, 3H),2.59 (s, 3H), 1.61 (d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 388.3. 10-52

(R)-3-fluoro-5-(1-((4-methyl-7-morpholinophthalazin-1-yl)amino)ethyl)benzonitrile ¹H NMR (400 MHz,CD₃OD) δ = 7.89 (d, J = 9.2 Hz, 1H), 7.63 (t, J = 1.2 Hz, 1H), 7.58-7.49(m, 3H), 7.33-7.28 (m, 1H), 5.42 (q, J = 6.8 Hz, 1H), 3.89- 3.84 (m,4H), 3.46-3.40 (m, 4H), 2.62 (s, 3H), 1.66 (d, J = 7.2 Hz, 3H). LCMS[M + 1]⁺: 392.2. 10-53

3-((1R)-1-((7-(6-oxa-3-azabicyclo[3.1.1]heptan-3-yl)-4-methylphthalazin-1-yl)amino)ethyl)-2- methylbenzonitrile Formatesalt ¹H NMR (400 MHz, CDCl₃) δ = 7.66 (t, J = 8.4 Hz, 2H), 7.48- 7.36(m, 2H), 7.28-7.25 (m, 2H), 7.15 (t, J = 7.6 Hz, 1H), 5.52-5.36 (m, 1H),4.88 (d, J = 6.4 Hz, 2H), 3.92-3.73 (m, 4H), 3.49-3.35 (m, 1H), 2.72 (s,3H), 2.57 (s, 3H), 2.01 (d, J = 9.2 Hz, 1H), 1.65 (d, J = 6.8 Hz, 3H).LCMS [M + 1]⁺: 400.2. 10-54

3-((R)-1-((7-((1R,4R)-2-oxa-5-azabicyclo[2.2.1]heptan-5-yl)-4-methylphthalazin-1-yl)amino)ethyl)-2-methylbenzonitrile Formate salt ¹H NMR (400 MHz,CD₃OD) δ = 8.55 (br s, 1H), 8.04 (d, J = 8.8 Hz, 1H), 7.72 (d, J = 7.6Hz, 1H), 7.52 (d, J = 7.6 Hz, 1H), 7.44-7.34 (m, 2H), 7.27 (t, J = 8.4Hz, 1H), 5.47 (q, J = 6.8 Hz, 1H), 4.98 (s, 1H), 4.82 (s, 1H), 3.97 (d,J = 7.2 Hz, 1H), 3.88 (d, J = 7.6 Hz, 1H), 3.72 (d, J = 10.4 Hz, 1H),3.43 (d, J = 10.4 Hz, 1H), 2.73 (s, 3H), 2.69 (s, 3H), 2.11 (s, 2H),1.64 (d, J = 7.2 Hz, 3H). LCMS [M + 1]⁺: 400.2. 10-55

(R)-2-methyl-3-(1-((4-methyl-7-(piperazin-1-yl)phthalazin-1-yl)amino)ethyl)benzonitrile Formate salt ¹H NMR (400MHz, CD₃OD) δ = 8.49 (br s, 1H), 8.11 (d, J = 8.8 Hz, 1H), 7.79-7.69 (m,3H), 7.52 (d, J = 7.2 Hz, 1H), 7.27 (t, J = 7.6 Hz, 1H), 5.50 (q, J =6.8 Hz, 1H), 3.83-3.77 (m, 4H), 3.29-3.25 (m, 4H), 2.74 (s, 3H), 2.72(s, 3H), 1.65 (d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 387.1. 10-56

3-((R)-1-((7-((S)-hexahydropyrazino[2,1-c][1,4]oxazin-8(1H)-yl)-4-methylphthalazin-1-yl)amino)ethyl)-2-methylbenzonitrile Formate salt ¹H NMR (400 MHz,CD₃OD) δ = 8.53 (s, 1H), 7.98 (d, J = 8.8 Hz, 1H), 7.72 (d, J = 8.0 Hz,1H), 7.67-7.59 (m, 2H), 7.50 (d, J = 7.6 Hz, 1H), 7.25 (t, J = 7.6 Hz,1H), 5.59-5.49 (m, 1H), 4.14 (d, J = 11.6 Hz, 1H), 3.98 (d, J = 12.0 Hz,1H), 3.93- 3.83 (m, 2H), 3.78-3.68 (m, 1H), 3.37 (d, J = 10.8 Hz 1H),3.16 (dt, J = 2.8, 12.0 Hz, 1H), 2.99 (br d, J = 11.6 Hz, 1H), 2.81 (d,J = 11.2 Hz 1H), 2.73 (s, 3H), 2.71-2.67 (m, 1H), 2.66 (s, 3H),2.53-2.37 (m, 3H), 1.63 (d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 443.2. 10-57

(R)-3-(1-((7-(4-(dimethylamino)piperidin-1-yl)-4-methylphthalazin-1-yl)amino)ethyl)-2- methylbenzonitrile Formate salt ¹HNMR (400 MHz, CD₃OD) δ = 8.53 (br s, 1H), 8.03 (br d, J = 9.2 Hz, 1H),7.76-7.62 (m, 3H), 7.52 (br d, J = 8.4 Hz, 1H), 7.27 (t, J = 7.6 Hz,1H), 5.55-5.45 (m, 1H), 4.39 (br d, J = 12.8 Hz, 2H), 3.13 (t, J = 12.8Hz, 2H), 3.03-2.94 (m, 1H), 2.73 (s, 3H), 2.68 (s, 3H), 2.62-2.54 (m,6H), 2.16 (d, J = 11.6 H, 2H), 1.76-1.67 (m, 2H), 1.65 (d, J = 7.2 Hz,3H). LCMS [M + 1]⁺: 429.2. 10-58

(R)-3-(1-((7-(3-hydroxy-3-methylazetidin-1-yl)-4-methylphthalazin-1-yl)amino)ethyl)-2- methylbenzonitrile ¹H NMR (400MHz, CD₃OD) δ = 8.10 (d, J = 8.8 Hz, 1H), 7.73 (d, J = 7.6 Hz, 1H),7.55-7.51 (m, 1H), 7.34-7.26 (m, 2H), 7.16 (dd, J = 2.0, 9.2 Hz, 1H),5.42 (d, J = 6.8 Hz, 1H), 4.20- 4.16 (m, 2H), 4.14-4.08 (m, 2H), 2.74(s, 3H), 2.73 (s, 3H), 1.66 (d, J = 7.2 Hz, 3H), 1.62 (s, 3H). LCMS [M +1]⁺: 388.2. 10-59

(R)-N-(1-(2-chloro-4-fluorophenyl)ethyl)-4-methyl-7-morpholinophthalazin-1-amine Hydrochloride salt ¹H NMR (400 MHz, DMSO-d₆) δ = 14.8 (s, 1H), 8.60 (d, J = 6.4 Hz, 1H), 8.17 (d, J = 9.2 Hz,1H), 7.92 (d, J = 0.8 Hz, 1H), 7.77 (dd, J = 2.4, 9.6 Hz, 1H), 7.58 (dd,J = 6.4, 8.8 Hz, 1H), 7.44 (dd, J = 2.8, 8.8 Hz, 1H), 7.22-7.15 (m, 1H),5.47 (m, 1H), 3.79-3.86 (m, 4H), 3.74-3.66 (m, 4H), 2.73 (s, 3H), 1.63(d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 401.1. 10-60

N-(1-(2-chloro-3-methylphenyl)ethyl)-4-methyl-7-morpholinophthalazin-1-amine ¹H NMR (400 MHz, DMSO- d₆) δ = 8.18 (s,1H), 8.09-8.07 (m, 1H), 7.80-7.79 (m, 1H), 7.74-7.71 (m, 1H), 7.32-7.31(m, 1H), 7.23-7.21 (m, 1H), 7.18-7.14 (m, 1H), 5.61-5.54 (m, 1H),3.85-3.82 (m, 4H), 3.63-3.62 (m, 4H), 2.66 (s, 3H), 2.37 (s, 3H),1.62-1.61 (m, 3H). LCMS [M + 1]⁺: 397.1. 10-61

(R)-4-methyl-N-(1-(3-methyl-5- (trifluoromethyl)phenyl)ethyl)-7-morpholinophthalazin-1-amine ¹H NMR (400 MHz, CD₃OD) δ = 8.19-8.16 (m,1H), 7.74- 7.73 (m, 2H) 7.53 (s, 2H), 7.34 (s, 1H), 5.29-5.27 (m, 1H),3.91-3.89 (m, 4H), 3.71-3.69 (m, 4H), 2.77 (s, 3H), 2.39 (s, 3H),1.71-1.69 (m, 3H). LCMS [M + 1]⁺: 431.1. 10-62

7-((S)-6-fluoro-1,4-diazepan-1-yl)-4-methyl-N-((R)- 1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine Hydrochloride salt ¹HNMR (400 MHz, DMSO- d₆) δ = 14.77 (s, 1H), 9.84 (s, 1H), 8.92 (s, 1H),8.78-8.77 (m, 1H), 8.19-8.16 (m, 1H), 7.89 (s, 1H), 7.83-7.82 (m, 1H),7.73-7.71 (m, 1H), 7.59- 7.55 (m, 1H), 7.37-7.33 (m, 1H), 5.49-5.37 (m,2H), 4.61- 4.55 (m, 1H), 4.25-4.21 (m, 1H), 4.09-3.97 (m, 2H), 3.62-3.58 (m, 2H), 3.48 (s, 2H), 2.73 (s, 3H), 2.56 (s, 3H), 1.86- 1.84 (m,3H). LCMS [M + 1]⁺: 462.1. 10-63

7-((R)-6-fluoro-1,4-diazepan-1-yl)-4-methyl-N-((R)- 1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine Hydrochloride salt ¹HNMR (400 MHz, DMSO- d₆) δ = 14.75 (s, 1H), 9.76 (s, 1H), 8.92 (s, 1H),8.69 (s, 1H), 8.19-8.16 (m, 1H), 7.85 (s, 1H), 7.79-7.77 (m, 1H), 7.73-7.71 (m, 1H), 7.57-7.55 (m, 1H), 7.37-7.33 (m, 1H), 5.51- 5.34 (m, 2H),4.56-4.50 (m, 1H), 4.20 (s, 1H), 4.10-4.00 (m, 2H), 3.55 (s, 2H), 3.49(s, 2H), 2.73 (s, 3H), 2.58 (s, 3H), 1.85-1.84 (m, 3H). LCMS [M + 1]⁺:462.1. 10-64

(R)-5-(1-methyl-4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6-yl)-1,2,5-thiadiazepane 1,1-dioxide ¹H NMR (400 MHz, Methanol- d₄) δ =8.02 (d, J = 9.1 Hz, 1H), 7.69 (d, J = 7.8 Hz, 1H), 7.55- 7.48 (m, 3H),7.24 (t, J = 7.9 Hz, 1H), 5.64 (q, J = 6.9 Hz, 1H), 4.17-4.09 (m, 4H),3.58- 3.54 (m, 2H), 3.39 (t, J = 6.0 Hz, 2H), 2.66 (s, 3H), 2.61 (d, J =1.6 Hz, 3H), 1.64 (d, J = 7.0 Hz, 3H). LCMS [M + 1]⁺: 494.4 10-65

(R)-N-(1-(3-(difluoromethyl)-2- methylphenyl)ethyl)-4-methyl-7-morpholinophthalazin-1-amine Hydrochloride salt ¹H NMR (400 MHz, CD₃OD)δ 8.16 (d, J = 9.3 Hz, 1H), 7.78- 7.69 (m, 2H), 7.59 (d, J = 7.8 Hz,1H), 7.38 (d, J = 7.6 Hz, 1H), 7.23 (t, J = 7.7 Hz, 1H), 6.94 (t, J =55.3 Hz, 1H), 5.53 (q, J = 6.9 Hz, 1H), 4.61 (s, 3H), 3.93-3.87 (m, 4H),3.73- 3.64 (m, 4H), 2.75 (s, 3H), 2.56 (s, 3H), 1.66 (d, J = 6.9 Hz,3H). LCMS [M + 1]⁺: 413.2. 10-66

(R)-7-(3-(dimethylamino)-3-methylazetidin-1-yl)-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine ¹H NMR (400 MHz, CDCl₃)δ = 7.76 (d, J = 8.8 Hz, 1H), 7.67 (d, J = 7.8 Hz, 1H), 7.53 (d, J = 7.8Hz, 1H), 7.25-7.19 (m, 1H), 6.90 (dd, J = 8.9, 2.2 Hz, 1H), 6.39 (d, J =2.2 Hz, 1H), 5.85 (s, 1H), 4.88 (s, 1H), 3.87 (dd, J = 7.1, 3.5 Hz, 2H),3.76 (dd, J = 7.1, 3.6 Hz, 2H), 2.68 (s, 3H), 2.56 (d, J = 1.7 Hz, 3H),2.23 (s, 6H), 1.65 (d, J = 6.7 Hz, 3H), 1.39 (s, 3H). LCMS [M + 1]⁺:458.4. 10-67

(R)-3-(1-((7-(4,4-difluoropiperidin-1-yl)-4-methylphthalazin-1-yl)amino)ethyl)-2- methylbenzonitrile ¹H NMR (400MHz, CD₃OD) δ 7.96 (d, J = 9.1 Hz, 1H), 7.76- 7.63 (m, 3H), 7.50 (dd, J= 7.7, 1.4 Hz, 1H), 7.25 (t, J = 7.8 Hz, 1H), 5.58 (q, J = 7.0 Hz, 1H),3.75 (t, J = 5.8 Hz, 5H), 2.74 (s, 3H), 2.64 (s, 3H), 2.21- 2.10 (m,5H), 1.64 (d, J = 7.0 Hz, 3H). LCMS [M + 1]⁺: 422.2. 10-68

(R)-3-(1-((7-(4-(azetidin-1-yl)piperidin-1-yl)-4-methylphthalazin-1-yl)amino)ethyl)-2- methylbenzonitrile ¹H NMR (400MHz, CD₃OD) δ = 7.87-7.83 (m, 1H), 7.73 (dd, J = 8.0, 1.4 Hz, 1H), 7.57-7.53 (m, 2H), 7.48 (dd, J = 7.6, 1.3 Hz, 1H), 7.24 (t, J = 7.8 Hz, 1H),5.62 (q, J = 6.9 Hz, 1H), 4.12 (d, J = 13.0 Hz, 2H), 2.98 (td, J = 12.7,2.6 Hz, 2H), 2.74 (s, 3H), 2.59 (s, 3H), 2.45-2.34 (m, 1H), 2.12 (p, J =7.1 Hz, 2H), 1.94-1.85 (m, 2H), 1.62 (d, J = 6.9 Hz, 3H), 1.37 (t, J =12.1 Hz, 2H). LCMS [M + 1]⁺: 441.2. 10-69

(R)-2-methyl-3-(1-((4-methyl-7-(6-methyl-5-oxo-2,6-diazaspiro[3.4]octan-2-yl)phthalazin-1- yl)amino)ethyl)benzonitrile¹H NMR (400 MHz, DMSO- d₆) δ 7.80 (d, J = 8.9 Hz, 1H), 7.74 (dd, J =7.9, 1.4 Hz, 1H), 7.59 (dd, J = 7.6, 1.4 Hz, 1H), 7.30 (dd, J = 9.2, 6.6Hz, 2H), 7.19 (d, J = 2.3 Hz, 1H), 7.01 (dd, J = 8.9, 2.2 Hz, 1H), 5.58-5.49 (m, 1H), 4.11 (t, J = 8.2 Hz, 2H), 4.00 (dd, J = 7.7, 4.3 Hz, 2H),2.79 (s, 3H), 2.66 (s, 3H), 2.44 (t, J = 6.9 Hz, 2H), 1.53 (d, J = 7.0Hz, 3H). LCMS [M + 1]⁺: 441.4. 10-70

(R)-2-methyl-3-(1-((4-methyl-7-(4-(1-methyl-1H-pyrazol-4-yl)piperazin-1-yl)phthalazin-1- yl)amino)ethyl)benzonitrile ¹HNMR (400 MHz, DMSO- d₆) δ = 7.81 (d, J = 8.9 Hz, 1H), 7.75 (dd, J = 8.0,1.4 Hz, 1H), 7.65-7.57 (m, 3H), 7.41 (d, J = 6.8 Hz, 1H), 7.36 (s, 1H),7.30 (t, J = 7.8 Hz, 1H), 7.25 (s, 1H), 5.56 (q, J = 6.7 Hz, 1H), 3.75(s, 3H), 3.59-3.53 (m, 4H), 3.05 (t, J = 5.1 Hz, 4H), 2.67 (s, 3H), 2.53(s, 3H), 1.55 (d, J = 6.9 Hz, 3H). LCMS [M + 1]⁺: 467.2. 10-71

2-methyl-3-((R)-1-((4-methyl-7-((1R,4R)-5-methyl-2,5-diazabicyclo[2.2.2]octan-2-yl)phthalazin-1-yl)amino)ethyl)benzonitrile ¹H NMR (400 MHz, CDCl₃) δ = 7.77 (d, J = 9.2Hz, 1H), 7.67 (d, J = 7.2 Hz, 1H), 7.45 (dd, J = 1.2, 7.6 Hz, 1H), 7.26(s, 1H), 7.22-7.14 (m, 2H), 6.56 (d, J = 2.4 Hz, 1H), 5.73 (br t, J =6.4 Hz, 1H), 4.95 (br d, J = 4.8 Hz, 1H), 4.03 (br s, 1H), 3.90 (m, 1H),3.31 (m, 1H), 3.10 (m, 1H), 2.96-2.87 (m, 2H), 2.68 (d, J = 7.2 Hz, 6H),2.47 (s, 3H), 2.24-2.13 (m, 1H), 2.07-1.96 (m, 1H), 1.93 (m, 1H), 1.61(d, J = 6.4 Hz, 3H). LCMS [M + 1]⁺: 427.2. 10-72

(R)-4-methyl-N-(1-(2-methylpyridin-3-yl)ethyl)-7-morpholinophthalazin-1-amine ¹H NMR (400 MHz, CD₃OD) δ = 8.21 (dd, J =1.6, 4.8 Hz, 1H), 7.90 (br d, J = 8.4 Hz, 1H), 7.85 (dd, J = 1.6, 7.6Hz, 1H), 7.62-7.53 (m, 2H), 7.16 (dd, J = 1.6, 7.6 Hz, 1H), 5.59 (q, J =6.8 Hz, 1H), 3.96-3.84 (m, 4H), 3.50-3.40 (m, 4H), 2.73 (s, 3H), 2.61(s, 3H), 1.64 (d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 364.2. 10-73

(R)-2-methyl-3-(1-((4-methyl-7-(6-methyl-2,6-diazaspiro[3.4]octan-2-yl)phthalazin-1- yl)amino)ethyl)benzonitrileformate salt ¹H NMR (400 MHz, CD₃OD) δ = 8.55 (s, 1H), 8.01 (d, J = 9.2Hz, 1H), 7.72 (d, J = 8.0 Hz, 1H), 7.55-7.50 (m, 1H), 7.30- 7.26 (m,1H), 7.25 (d, J = 2.0 Hz, 1H), 7.12-7.08 (m, 1H), 5.57-5.41 (m, 1H),4.24-4.16 (m, 2H), 4.16-4.10 (m, 2H), 3.04 (s, 2H), 2.84 (t, J = 6.8 Hz,2H), 2.74 (s, 3H), 2.68 (s, 3H), 2.52 (s, 3H), 2.32 (t, J = 6.8 Hz, 2H),1.64 (d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 427.3. 10-74

(R)-3-(1-((7-(3-(dimethylamino)-3-methylazetidin-1-yl)-4-methylphthalazin-1-yl)amino)ethyl)-2- methylbenzonitrileHydrochloride salt ¹H NMR (400 MHz, CD₃OD) δ = 8.19 (d, J = 9.2 Hz, 1H),7.79 (d, J = 7.2 Hz, 1H), 7.61-7.49 (m, 2H), 7.34-7.19 (m, 2H), 5.44 (q,J = 7.2 Hz, 1H), 4.56 (dd, J = 5.6, 9.6 Hz, 2H), 4.29 (dd, J = 6.0, 10.0Hz, 2H), 2.94 (s, 6H), 2.76 (d, J = 9.6 Hz, 6H), 1.83 (s, 3H), 1.69 (d,J = 7.2 Hz, 3H). LCMS [M + 1]⁺: 415.3. 10-75

(R)-3-(1-((7-(3-(dimethylamino)azetidin-1-yl)-4-methylphthalazin-1-yl)amino)ethyl)-2- methylbenzonitrile Hydrochloridesalt ¹H NMR (400 MHz, CD₃OD) δ = 8.19 (d, J = 9.2 Hz, 1H), 7.79 (d, J =8.0 Hz, 1H), 7.60-7.51 (m, 2H), 7.33-7.24 (m, 2H), 5.44 (q, J = 6.8 Hz,1H), 4.67- 4.57 (m, 2H), 4.51 (td, J = 5.2, 10.4 Hz, 2H), 4.47-4.38 (m,1H), 3.01 (s, 6H), 2.76 (d, J = 7.2 Hz, 6H), 1.69 (d, J = 7.2 Hz, 3H).LCMS [M + 1]⁺: 401.2. 10-76

(R)-7-(3-(dimethylamino)azetidin-1-yl)-N-(1-(2-fluoro-3-(trifluoromethyl)phenyl)ethyl)-4- methylphthalazin-1-amine ¹HNMR (400 MHz, DMSO- d₆): δ = 7.79 (d, J = 8.8 Hz, 1H), 7.71 (t, J = 6.8Hz, 1H), 7.60 (t, J = 6.8 Hz, 1H), 7.33- 7.22 (m, 2H), 7.20 (s, 1H),7.08- 6.93 (m, 1H), 5.73-5.70 (m, 1H), 4.21-4.04 (m, 2H), 3.90- 3.70 (m,2H), 3.29-3.27 (m, 1H), 2.52-2.51 (m, 3H), 2.16 (s, 6H), 1.61 (d, J =6.8 Hz, 3H). LCMS [M + 1]⁺: 448.3. 10-77

(R)-N-(1-(2-fluoro-3-(trifluoromethyl)phenyl)ethyl)-4-methyl-7-morpholinophthalazin-1-amine ¹H NMR (400 MHz, CD₃OD) δ 7.91(dd, J = 13.0, 8.8 Hz, 1H), 7.71-7.55 (m, 3H), 7.48 (d, J = 7.5 Hz, 1H),7.18 (t, J = 7.9 Hz, 1H), 5.72 (q, J = 7.0 Hz, 1H), 3.97-3.88 (m, 4H),3.53- 3.45 (m, 4H), 2.62-2.57 (m, 3H), 1.69 (d, J = 7.0 Hz, 3H). LCMS[M + 1]⁺: 435.2. 10-78

(R)-7-(3-(dimethylamino)-3-methylazetidin-1-yl)-N-(1-(2-fluoro-3-(trifluoromethyl)phenyl)ethyl)-4-methylphthalazin-1-amine ¹H NMR (400 MHz, DMSO- d₆) δ 7.79 (d, J = 8.9Hz, 1H), 7.71 (t, J = 7.3 Hz, 1H), 7.60 (t, J = 7.3 Hz, 1H), 7.32-7.19(m, 3H), 7.03 (dd, J = 8.8, 2.2 Hz, 1H), 3.83-3.74 (m, 4H), 3.29 (s,3H), 2.15 (s, 6H), 1.61 (d, J = 7.1 Hz, 3H), 1.34 (s, 3H). LCMS [M +1]⁺: 462.1. 10-79

(R)-2-methyl-3-(1-((4-methyl-7-(5-methyl-8-oxa-2,5-diazaspiro[3.5]nonan-2-yl)phthalazin-1- yl)amino)ethyl)benzonitrileFormate salt ¹H NMR (400 MHz, CD₃OD) δ = 7.99 (d, J = 9.0 Hz, 1H), 7.73(dd, J = 7.9, 1.3 Hz, 1H), 7.50 (dt, J = 7.7, 1.3 Hz, 1H), 7.29-7.23 (m,2H), 7.16-7.12 (m, 1H), 5.51 (q, J = 7.0 Hz, 1H), 4.32 (d, J = 9.4 Hz,2H), 3.86-3.75 (m, 6H), 2.73 (s, 3H), 2.66 (s, 3H), 2.63-2.60 (m, 2H),2.50 (s, 3H), 1.63 (d, J = 6.9 Hz, 3H). LCMS [M + 1]⁺: 443.2. 10-80

(R)-2-methyl-3-(1-((4-methyl-7-(6-oxa-2-azaspiro[3.4]octan-2-yl)phthalazin-1- yl)amino)ethyl)benzonitrileHydrochloride salt ¹H NMR (400 MHz, DMSO- d₆) δ 14.65 (s, 1H), 8.47 (s,1H), 8.11 (d, J = 9.0 Hz, 1H), 7.77 (d, J = 8.0 Hz, 1H), 7.64 (d, J =7.5 Hz, 1H), 7.48 (s, 1H), 7.34 (t, J = 7.8 Hz, 1H), 7.18-7.11 (m, 1H),5.37- 5.29 (m, 1H), 4.25-4.15 (m, 4H), 3.91-3.86 (m, 2H), 3.78 (t, J =6.9 Hz, 2H), 2.69 (s, 3H), 2.66 (s, 3H), 2.24 (t, J = 6.9 Hz, 2H), 1.60(d, J = 7.0 Hz, 3H). LCMS [M + 1]⁺: 414.2. 10-81

3-((R)-1-((7-((R)-hexahydropyrrolo[1,2-a]pyrazin-2(1H)-yl)-4-methylphthalazin-1-yl)amino)ethyl)-2- methylbenzonitrile ¹HNMR (400 MHz, CD₃OD) δ 7.87 (d, J = 9.8 Hz, 1H), 7.73 (dd, J = 7.9, 1.4Hz, 1H), 7.63- 7.56 (m, 2H), 7.47 (d, J = 7.6 Hz, 1H), 7.23 (t, J = 7.8Hz, 1H), 5.61 (q, J = 6.9 Hz, 1H), 4.20 (d, J = 11.9 Hz, 1H), 4.05 (d, J= 12.5 Hz, 1H), 3.26- 3.02 (m, 3H), 2.73 (s, 3H), 2.59 (s, 3H), 2.45(td, J = 11.4, 3.4 Hz, 1H), 2.28 (q, J = 9.1 Hz, 2H), 2.06-1.83 (m, 4H),1.62 (d, J = 6.9 Hz, 3H), 1.60-1.51 (m, 1H). LCMS [M + 1]⁺: 427.3. 10-82

2-methyl-3-((R)-1-((4-methyl-7-((R)-octahydro-2H-pyrido[1,2-a]pyrazin-2-yl)phthalazin-1- yl)amino)ethyl)benzonitrileHydrochloride salt ¹H NMR (400 MHz, Methanol- d₄) δ 8.25 (d, J = 9.3 Hz,1H), 7.97 (d, J = 2.4 Hz, 1H), 7.89- 7.77 (m, 2H), 7.56 (d, J = 7.6 Hz,1H), 7.30 (t, J = 7.8 Hz, 1H), 5.47 (q, J = 7.0 Hz, 1H), 4.60 (t, J =11.8 Hz, 2H), 3.67 (d, J = 12.5 Hz, 1H), 3.59 (t, J = 11.6 Hz, 2H),3.49-3.35 (m, 1H), 3.33-3.26 (m, 1H), 3.18- 3.07 (m, 1H), 2.80 (s, 3H),2.76 (s, 3H), 2.21-2.13 (m, 1H), 2.05-2.00 (m, 3H), 2.00- 1.92 (m, 1H),1.84-1.68 (m, 5H). LCMS [M + 1]⁺: 441.3. 10-83

(R)-2-methyl-3-(1-((4-methyl-7-(3-methyl-3-morpholinoazetidin-1-yl)phthalazin-1- yl)amino)ethyl)benzonitrileFormate salt ¹H NMR (400 MHz, CD₃OD) δ = 8.55 (s, 1H), 8.02 (d, J = 9.0Hz, 1H), 7.74 (dd, J = 7.9, 1.4 Hz, 1H), 7.52 (dd, J = 7.7, 1.4 Hz, 1H),7.32-7.22 (m, 2H), 7.13 (dd, J = 9.0, 2.3 Hz, 1H), 5.50 (q, J = 6.9 Hz,1H), 4.01 (t, J = 7.4 Hz, 2H), 3.88 (dd, J = 8.3, 5.9 Hz, 2H), 3.75 (t,J = 4.5 Hz, 3H), 2.72 (s, 3H), 2.69 (s, 3H), 2.59-2.54 (m, 4H), 1.64 (d,J = 7.0 Hz, 3H), 1.48 (s, 3H). LCMS [M + 1]⁺: 457.3. 10-84

(R)-2-methyl-3-(1-((4-methyl-7-(5-methyl-2,5-diazaspiro[3.4]octan-2-yl)phthalazin-1- yl)amino)ethyl)benzonitrile ¹HNMR (400 MHz, CD₃OD) δ 7.88 (d, J = 8.9 Hz, 1H), 7.76 (dd, J = 7.9, 1.4Hz, 1H), 7.51 (dd, J = 7.7, 1.4 Hz, 1H), 7.26 (t, J = 7.8 Hz, 1H), 7.18(d, J = 2.3 Hz, 1H), 7.09 (dd, J = 8.9, 2.3 Hz, 1H), 5.63 (q, J = 6.9Hz, 1H), 4.27 (dd, J = 8.5, 2.6 Hz, 2H), 3.92 (d, J = 8.5 Hz, 2H), 2.84(t, J = 7.3 Hz, 2H), 2.76 (s, 3H), 2.61 (s, 3H), 2.54 (s, 3H), 2.28-2.20(m, 2H), 1.96-1.84 (m, 2H), 1.64 (d, J = 6.9 Hz, 3H). LCMS [M + 1]⁺:427.3. 10-85

7-((1R,4R)-2-oxa-5-azabicyclo[2.2.1]heptan-5-yl)-N-((R)-1-(3-(difluoromethyl)-2-fluorophenyl)ethyl)-4-methylphthalazin-1-amine ¹H NMR (400 MHz, DMSO- d₆) δ 7.78 (d, J = 9.0Hz, 1H), 7.57 (t, J = 7.4 Hz, 1H), 7.45 (t, J = 7.1 Hz, 1H), 7.33-7.15(m, 4H), 5.73-5.65 (m, 1H), 4.92 (s, 1H), 4.75 (s, 1H), 3.91- 3.84 (m,1H), 3.75-3.69 (m, 1H), 3.67-3.60 (m, 1H), 3.27- 3.21 (m, 1H), 2.04-1.93(m, 2H), 1.60 (d, J = 7.1 Hz, 3H), 1.24 (s, 1H). LCMS [M + 1]⁺: 429.3.10-86

N-((R)-1-(3-(difluoromethyl)-2-fluorophenyl)ethyl)-7-((S)-hexahydropyrazino[2,1-c][1,4]oxazin-8(1H)-yl)-4-methylphthalazin-1-amine Formate salt ¹H NMR (400 MHz, DMSO- d₆) δ8.15 (s, 1H), 7.82 (d, J = 9.7 Hz, 1H), 7.64-7.54 (m, 2H), 7.46 (t, J =7.1 Hz, 1H), 7.38-7.34 (m, 1H), 7.27- 7.18 (m, 2H), 5.70 (t, J = 7.0 Hz,1H), 4.12-4.04 (m, 1H), 3.92-3.77 (m, 3H), 3.64- 3.53 (m, 1H), 3.27-3.20(m, 1H), 3.03-2.90 (m, 2H), 2.78- 2.71 (m, 1H), 2.70-2.67 (m, 1H), 2.54(s, 3H), 2.42-2.34 (m, 1H), 2.32-2.22 (m, 2H), 1.62 (d, J = 7.1 Hz, 3H).LCMS [M + 1]⁺: 472.4. 10-87

3-((R)-1-((7-((1R,4R)-2-oxa-5-azabicyclo[2.2.1]heptan-5-yl)-4-methylphthalazin-1-yl)amino)ethyl)-2-(trifluoromethyl)benzonitrile Hydrochloride salt ¹HNMR (400 MHz, CD₃OD) δ = 8.42 (d, J = 9.2 Hz, 1H), 8.37 (d, J = 8.0 Hz,1H), 8.13 (d, J = 7.6 Hz, 1H), 7.98 (t, J = 7.9 Hz, 1H), 7.82-7.77 (m,1H), 7.75- 7.71 (m, 1H), 5.90 (q, J = 7.0 Hz, 1H), 5.37 (s, 1H), 5.14(s, 1H), 4.30 (d, J = 7.6 Hz, 1H), 4.19 (d, J = 7.7 Hz, 1H), 4.08- 4.01(m, 1H), 3.80 (d, J = 10.5 Hz, 1H), 3.02 (s, 2H), 2.43 (d, J = 3.0 Hz,3H), 2.03 (d, J = 6.9 Hz, 3H). LCMS [M + 1]⁺: 454.2.

Example 11-1(R)-(4-(1-methyl-4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6-yl)piperazin-1-yl)(oxetan-3-yl)methanone

To a solution of(R)-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(piperazin-1-yl)phthalazin-1-amine(20.0 mg, 46.6 μmol, 1.00 eq.) and oxetane-3-carboxylic acid (5.70 mg,55.9 μmol, 1.20 eq.) in DMF (0.50 mL) was added HATU (21.3 mg, 55.9μmol, 1.20 eq.) and N, N-diisopropylethylamine (18.1 mg, 140 μmol, 24.3μL, 3.00 eq.). The mixture was stirred at 25° C. for 1 hour thenpurified by prep-HPLC (Waters Xbridge 150×25 mm×5 um; mobile phase:mobile phase A: [water (10 mM NH₄HCO₃), mobile phase B: acetonitrile]; B%: 27%-57%) to give(R)-(4-(1-methyl-4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6-yl)piperazin-1-yl)(oxetan-3-yl)methanone(9.00 mg, 17.4 μmol, 37.4% yield, 99.4% purity) as a off-white solid.LCMS [M+1]⁺: 514.3.

¹H NMR (400 MHz, CD₃OD) δ=8.02 (d, J=9.2 Hz, 1H), 7.73-7.63 (m, 3H),7.50 (d, J=7.6 Hz, 1H), 7.25 (t, J=8.0 Hz, 1H), 5.63 (q, J=7.2 Hz, 1H),4.89 (br s, 4H), 4.33-4.22 (m, 1H), 3.89-3.78 (m, 2H), 3.69-3.58 (m,4H), 3.55-3.47 (m, 2H), 2.67 (s, 3H), 2.61 (s, 3H), 1.64 (d, J=6.8 Hz,3H).

Following the teachings of the General Reaction Scheme III, and theprocedure described for the preparation of Examples 11-1, the followingcompounds of Formula (I), Examples 11-2 to 11-6 shown in Table 11 wereprepared.

TABLE 11 Ex. # Structure Spectral Data 11-2

¹H NMR (400 MHz, CD₃OD) δ = 7.95-7.88 (m, 1H), 7.70 (d, J = 8.0 Hz, 1H),7.63-7.57 (m, 2H), 7.48 (d, J = 7.6 Hz, 1H), 7.23 (t, J = 7.6 Hz, 1H),5.72 (d, J = 6.8 Hz, 1H), 4.02-3.94 (m, 2H), 3.88-3.78 (m, 4H),3.61-3.49 (m, 6H), 3.10-3.00 (m, 1H), 2.65-2.57 (m, 6H), 1.89-1.77 (m,2H), 1.71-1.64 (m, 2H), 1.63 (d, J = 6.8 Hz, 3H). LCMS [M + 1] ⁺: 542.4.(R)-(4-(1-methyl-4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6-yl)piperazin-1-yl)(tetrahydro-2H-pyran-4- yl)methanone 11-3

¹H NMR (400 MHz, CD₃OD) δ = 7.94-7.89 (m, 1H), 7.70 (d, J = 7.6 Hz, 1H),7.65-7.59 (m, 2H), 7.48 (d, J = 7.6 Hz, 1H), 7.23 (t, J = 7.6 Hz, 1H),5.72 (q, J = 6.8 Hz, 1H), 3.91 (br s, 4H), 3.60-3.52 (m, 4H), 2.65- 2.58(m, 6H), 1.63 (d, J = 6.8 Hz, 3H), 1.45-1.39 (m, 2H), 1.34-1.25 (m, 2H).LCMS [M + 1] ⁺: 566.4. (R)-(4-(1-methyl-4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin- 6-yl)piperazin-1-yl)(1-(trifluoromethyl)cyclopropyl)methanone 11-4

¹H NMR (400 MHz, CD₃OD) δ 7.90 (d, J = 8.8 Hz, 1H), 7.70 (d, J = 7.8 Hz,1H), 7.62-7.57 (m, 2H), 7.49-7.45 (m, 1H), 7.22 (t, J = 7.8 Hz, 1H),5.71 (q, J = 6.9 Hz, 1H), 4.03-3.85 (m, 3H), 3.85-3.78 (m, 5H), 3.52(tt, J = 11.6, 3.8 Hz, 6H), 2.24-2.09 (m, 2H), 1.62 (d, J = 6.9 Hz, 3H).LCMS [M + 1] ⁺: 528.3. (4-(1-methyl-4-(((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6-yl)piperazin-1-yl)((R)-tetrahydrofuran-3- yl)methanone 11-5

¹H NMR (400 MHz, CD₃OD) δ 8.11 (d, J = 9.2 Hz, 1H), 7.75- 7.68 (m, 4H),7.52 (d, J = 7.8 Hz, 1H), 7.27 (t, J = 7.9 Hz, 1H), 5.61 (q, J = 6.9 Hz,1H), 4.05-3.69 (m, 12H), 3.55 (tt, J = 8.3, 6.3 Hz, 1H), 2.72 (s, 3H),2.63 (d, J = 1.8 Hz, 3H), 2.26-2.13 (m, 2H), 1.67 (d, J = 7.0 Hz, 3H).LCMS [M + 1] ⁺: 528.3. (4-(1-methyl-4-(((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6-yl)piperazin-1-yl)((S)-tetrahydrofuran-3- yl)methanone 11-6

¹H NMR (400 MHz, CD₃OD) δ = 9.04 (s, 1H), 7.71 (d, J = 7.9 Hz, 1H), 7.50(d, J = 7.6 Hz, 1H), 7.36 (s, 1H), 7.26 (t, J = 7.7 Hz, 1H), 5.59 (q, J= 6.8 Hz, 1H), 4.66-4.55 (m, 4H), 4.03-3.94 (m, 4H), 3.86-3.80 (m, 4H),2.73 (s, 3H), 2.63 (s, 3H), 2.08-2.00 (m, 1H), 1.62 (d, J = 6.9 Hz, 3H),0.97- 0.85 (m, 4H). LCMS [M + 1] ⁺: 456.4.(R)-3-(1-((7-(4-(cyclopropanecarbonyl)piperazin-1-yl)-4-methylpyrido[3,4-d]pyridazin-1-yl)amino)ethyl)-2-methylbenzonitrile

Example 12-1(R)-4-methyl-7-(4-(1-methyl-1H-pyrazol-4-yl)piperazin-1-yl)-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)pyrido[3,4-d]pyridazin-1-amine

Step A: A solution of 7-chloro-4-methylpyrido[3,4-d]pyridazin-1(2H)-one(5.00 g, 25.6 mmol, 1.00 eq.) in POCl₃ (137 g, 893 mmol, 83.0 mL, 34.9eq) was added N,N-diisopropylethylamine (9.91 g, 76.7 mmol, 13.4 mL, 3eq.) dropwise at 25° C., then the reaction was stirred at 110° C. for 2h. After this time the mixture was cooled to 25° C. and concentratedunder vacuum to give a residue, the residue was diluted with ethylacetate (300 mL) at 0° C., adjusted to pH=7 with slow addition of sodiumbicarbonate saturated aqueous solution. The combined organic phases werewashed with brine (200 mL×2), dried over anhydrous sodium sulfate,filtered, and concentrated under vacuum to give1,7-dichloro-4-methylpyrido[3,4-d]pyridazine (4.10 g, 19.2 mmol, 74.9%yield) as a pink solid.

¹H NMR (400 MHz, DMSO-d₆) δ=9.65 (s, 1H), 8.22 (s, 1H), 3.02 (s, 3H).

Step B: To a solution of 1,7-dichloro-4-methylpyrido[3,4-d]pyridazine(300 mg, 1.40 mmol, 1.00 eq) and(R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethan-1-amine (285 mg, 1.40mmol, 1.00 eq) in DMSO (5.00 mL) was added potassium fluoride (244 mg,4.20 mmol, 98.5 μL, 3.00 eq) and N, N-diisopropylethylamine (543 mg,4.20 mmol, 732 μL, 3.00 eq). The mixture was stirred at 130° C. for 12hours, then cooled to room temperature and water (20.0 mL) was added.The mixture was extracted with ethyl acetate (10.0 mL×3), and thecombined organic layers were washed with brine (5.00 mL×2), dried oversodium sulfate, filtered, and concentrated under reduced pressure togive a residue. The residue was purified by column chromatography (SiO₂,petroleum ether/ethyl acetate=1/0 to 5/1) to give(R)-7-chloro-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)pyrido[3,4-d]pyridazin-1-amine(320 mg, 840 μmol, 60.0% yield) as a yellow solid. LCMS [M+1]⁺: 381.0.

Step C: A mixture of(R)-7-chloro-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)pyrido[3,4-d]pyridazin-1-amine(40.0 mg, 105 μmol, 1.00 eq), 1-(1-methyl-1H-pyrazol-4-yl)piperazine(58.9 mg, 210 μmol, 2.00 eq., TFA salt), cesium carbonate (171 mg, 525μmol, 5.00 eq), RuPhos Pd G3 (8.79 mg, 10.5 μmol, 0.10 eq) in dioxane(1.00 mL) was degassed and purged with nitrogen 3 times, and then themixture was stirred at 80° C. for 10 hours under a nitrogen atmosphere.The reaction mixture was quenched by addition water (15.0 mL) at 20° C.,and then extracted with ethyl acetate (5.00 mL×3). The combined organiclayers were washed with brine (5.00 mL), dried over sodium sulfate,filtered, and concentrated under reduced pressure to give a residue. Theresidue was purified by prep-HPLC (column: Phenomenex Gemini-NX C1875×30 mm×3 um; mobile phase: phase A: water (0.04% HCl), phase B:acetonitrile; gradient: B %: 30%-60%) to give(R)-4-methyl-7-(4-(1-methyl-1H-pyrazol-4-yl)piperazin-1-yl)-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)pyrido[3,4-d]pyridazin-1-amine(9.51 mg, 15.1% yield, HCl salt) as a light yellow solid. LCMS [M+1]⁺:511.1.

¹H NMR (400 MHz, DMSO-d₆) δ=9.00 (s, 1H), 7.72 (d, J=7.6 Hz, 1H), 7.57(d, J=6.4 Hz, 1H), 7.52 (d, J=7.6 Hz, 1H), 7.48 (s, 1H), 7.36 (s, 1H),7.35-7.29 (m, 1H), 7.25 (s, 1H), 5.63 (quin, J=6.8 Hz, 1H), 3.88-3.83(m, 4H), 3.75 (s, 2H), 3.78-3.72 (m, 1H), 3.04-2.98 (m, 4H), 2.56 (s,6H), 1.55 (d, J=6.8 Hz, 3H).

Example 12-27-(6-oxa-3-azabicyclo[3.1.1]heptan-3-yl)-4-methyl-N—((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)pyrido[3,4-d]pyridazin-1-amine

To a solution of(R)-7-chloro-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)pyrido[3,4-d]pyridazin-1-amine(50.0 mg, 131 μmol, 1.00 eq.) and 6-oxa-3-azabicyclo[3.1.1]heptane (35.6mg, 263 μmol, 2.00 eq., HCl) in dioxane (2.00 mL) was added cesiumcarbonate (171 mg, 525 μmol, 4.00 eq.), RuPhos (6.10 mg, 13.1 μmol, 0.10eq.) and Pd₂(dba)₃ (6.00 mg, 6.60 μmol, 0.05 eq.) under a nitrogenatmosphere. The mixture was stirred at 110° C. for 2 hours then cooledto 25° C., filtered, and the filtrate was quenched with water (10.0 mL),and then extracted with ethyl acetate (30.0 mL). The combined organiclayers were washed with brine (10.0 mL), dried over anhydrous sodiumsulfate, filtered, and concentrated under reduced pressure to give aresidue. The residue was purified by prep-HPLC (column: Waters XbridgeBEH C18 100×25 mm×5 um; mobile phase: phase A: water (10 mM NH₄HCO₃),phase B: acetonitrile; gradient: B %: 30%-60%) to give7-(6-oxa-3-azabicyclo[3.1.1]heptan-3-yl)-4-methyl-N—((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)pyrido[3,4-d]pyridazin-1-amine(8.64 mg, 18.9 μmol, 14.4% yield) as a yellow solid. LCMS [M+1]⁺: 444.1.

¹H NMR (400 MHz, DMSO-dd) 5=9.03 (s, 1H), 7.74 (d, J=7.6 Hz, 1H), 7.57(s, 1H), 7.52 (d, J=8.0 Hz, 1H), 7.31 (t, J=8.0 Hz, 1H), 7.27 (s, 1H),5.66 (t, J=7.2 Hz, 1H), 4.80 (d, J=6.4 Hz, 2H), 3.91-3.90 (m, 2H),3.75-3.68 (m, 2H), 3.23-3.16 (m, 1H), 2.57 (s, 6H), 1.95 (d, J=9.2 Hz,1H), 1.55 (d, J=7.2 Hz, 3H).

SFC conditions: Chiralcel OD-3 3 μm, 0.46 cm id×5 cm L; Mobile phase: Afor SFC C02 and B for MeOH (0.05% isopropylamine); Gradient: B in A from10% to 40% in 3 minutes; Flow rate: 4.0 mL/min; Column temperature: 35°C.; Wavelength: 220 nm; System Back Pressure: 100 bar.

Following the teachings of the General Reaction Scheme III, and theprocedure described for the preparation of Examples 12-1 and 12-2, thefollowing compounds of Formula (I), Examples 12-3-12-134 shown in Table12 were prepared.

TABLE 12 Ex. # Structure Spectral Data 12-3

¹H NMR (400 MHz, DMSO- d₆) δ = 8.94 (s, 1H), 7.72 (d, J = 7.6 Hz, 1H),7.52 (d, J = 7.6 Hz, 2H), 7.34-7.28 (m, 1H), 7.10 (s, 1H), 5.67- 5.57(m, 1H), 4.78 (s, 4H), 4.29 (s, 4H), 2.56-2.52 (m, 6H), 1.54 (d, J = 6.8Hz, 3H). LCMS [M + 1] ⁺: 444.1. 12-4

¹H NMR (400 MHz, DMSO- d₆) δ = 14.73 (s, 1H), 9.23 (s, 1H), 9.19 (br s,1H), 8.04 (s, 1H), 7.89 (d, J = 7.6 Hz, 1H), 7.55 (d, J = 7.6 Hz, 1H),7.37- 7.35 (m, 1H), 5.45-5.41 (m, 1H), 4.76-4.73 (m, 2H), 3.67- 3.63 (m,2H), 2.78-2.74 (m, 5H), 2.56 (s, 3H), 1.64 (d, J = 6.8 Hz, 3H), 1.23 (d,J = 4.8 Hz, 6H). LCMS [M + 1] ⁺: 460.1. 12-5

¹H NMR (400 MHz, DMSO-d₆) δ = 14.66 (s, 1H), 9.23 (s, 1H), 9.00 (s, 1H),7.90 (s, 1H), 7.83 (d, J = 7.6 Hz, 1H), 7.56 (d, 7.6 Hz, 1H), 7.36 (t, J= 8.0 Hz, 1H), 5.48-5.37 (m, 1H), 4.17- 4.08 (m, 2H), 4.06-4.02 (m, 2H),3.74-3.69 (m, 2H), 2.73 (s, 3H), 2.56 (s, 3H), 1.63 (d, J = 6.8 Hz, 3H),1.19 (d, J = 6.4 Hz, 6H). LCMS [M + 1] ⁺: 460.1. 12-6

¹H NMR (400 MHz, DMSO-d₆) δ = 14.65 (s, 1H), 9.25 (s, 1H), 8.92 (s, 1H),7.91-7.78 (m, 2H), 7.57 (d, J = 8.0 Hz, 1H), 7.41-7.32 (m, 1H),5.49-5.37 (m, 1H), 4.18-4.09 (m, 2H), 4.09-4.00 (m, 2H), 3.76-3.63 (m,2H), 2.73 (s, 3H), 2.56 (s, 3H), 1.63 (d, J = 7.2 Hz, 3H), 1.20 (d, J =6.4 Hz, 6H). LCMS [M + 1] ⁺: 460.1. 12-7

¹H NMR (400 MHz, CD₃OD) δ = 9.19 (s, 1H), 7.68 (d, J = 8.0 Hz, 1H),7.58-7.51 (m, 2H), 7.32-7.26 (m, 1H), 5.49 (q, J = 6.8 Hz, 1H), 4.46 (brs, 2H), 3.58-3.51 (m, 2H), 2.75 (s, 3H), 2.61 (s, 3H), 1.81-1.68 (m,4H), 1.66 (d, J = 6.8 Hz, 3H), 1.31 (s, 3H). LCMS [M + 1]⁺ : 460.1. 12-8

¹H NMR (400 MHz, CD₃OD) δ = 8.96 (s, 1H), 7.68 (d, J = 8.0 Hz, 1H), 7.49(d, J = 7.6 Hz, 1H), 7.29-7.19 (m, 1H), 7.10 (s, 1H), 5.74-5.61 (m, 1H),5.15 (s, 1H), 4.80 (s, 1H), 3.95 (dd, J = 1.2, 7.6 Hz, 1H), 3.85 (d, J =7.2 Hz, 1H), 3.66 (dd, J = 1.2, 10.4 Hz, 1H), 3.51 (d, J = 10.4 Hz, 1H),2.61 (s, 6H), 2.14-1.99 (m, 2H), 1.61 (d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 444.2. 12-9

¹H NMR (400 MHz, DMSO- d₆) δ = 8.96 (s, 1H), 7.67 (d, J = 8.0 Hz, 1H),7.48 (d, J = 7.6 Hz, 1H), 7.25-7.22 (m, 1H), 7.09 (s, 1H), 5.68-5.66 (m,1H), 5.15 (s, 1H), 4.79 (s, 1H), 3.96-3.93 (m, 1H), 3.86-3.84 (m, 1H),3.68-3.65 (m, 1H), 3.51-3.49 (m, 1H), 2.61-2.60 (m, 6H), 2.06 (s, 2H),1.61 (d, J = 7.2 Hz, 3H). LCMS [M + 1]⁺: 444.1. 12-10

¹H NMR (400 MHz, DMSO- d₆) δ = 9.00 (s, 1H), 7.71 (d, J = 8.0 Hz, 1H),7.61 (d, J = 1.2 7.6, Hz, 1H), 7.53 (d, J = 6.8 Hz, 1H), 7.40 (s, 1H),7.32 (t, J = 7.6 Hz, 1H), 5.53 (m, 1H), 3.74-3.83 (m, 4H), 3.63-3.73 (m,4H), 2.66 (s, 3H), 2.56 (s, 3H), 1.54 (d, J = 6.8 Hz, 3H). LCMS [M +1]⁺: 389.1 12-11

¹H NMR (400 MHz, DMSO- d₆) δ = 9.44 (s, 1H), 8.25 (s, 1H), 7.75 (d, J =7.6 Hz, 1H), 7.56 (d, J = 7.6 Hz, 1H), 7.37- 7.33 (m, 1H), 5.81-5.77 (m,1H), 5.48-5.43 (m, 1H), 4.12- 3.73 (m, 3H), 3.41-3.23 (m, 2H), 2.93-2.83(m, 6H), 2.66- 2.57 (m, 1H), 2.55 (s, 3H), 2.33- 2.22 (m, 1H), 1.58 (d,J = 6.8 Hz, 3H). LCMS [M + 1] ⁺: 446.1. 12-12

¹H NMR (400 MHz, DMSO- d₆) δ = 9.07 (s, 1H), 7.84 (s, 1H), 7.73-7.71 (m,1H), 7.51 (d, J = 7.6 Hz, 1H), 7.32-7.30 (m, 1H), 5.64-5.59 (m, 1H),5.27-5.24 (m, 1H), 3.79-3.75 (m, 2H), 3.06-3.01 (m, 2H), 2.61 (s, 3H),2.56 (s, 3H), 2.31 (s, 3H), 1.52 (d, J = 6.8 Hz, 3H). LCMS [M + 1] ⁺:432.1. 12-13

¹H NMR (400 MHz, CD₃OD) δ = 9.31 (s, 1H), 7.81 (s, 1H), 7.71 (d, J = 8.0Hz, 1H), 7.54 (d, J = 8.0 Hz, 1H), 7.29 (t, J = 8.0 Hz, 1H), 5.53 (q, J= 6.8 Hz, 1H), 4.50 (br s, 4H), 3.30 (br s, 4H), 2.81 (s, 3H), 2.62 (s,3H), 1.68 (d, J = 6.8 Hz, 3H). LCMS [M + 1] ⁺: 480.2. 12-14

¹H NMR (400 MHz, CD₃OD) δ = 9.32 (s, 1H), 7.90 (br s, 1H), 7.78 (d, J =7.6 Hz, 1H), 7.55 (d, J = 8.0 Hz, 1H), 7.30 (t, J = 7.6 Hz, 1H), 5.55(q, J = 6.8 Hz, 1H), 5.25-5.01 (m, 2H), 4.29-4.09 (m, 2H), 4.08-3.98 (m,1H), 3.93-3.34 (m, 8H), 2.83 (s, 3H), 2.64 (s, 3H), 1.72 (d, J = 6.8 Hz,3H). LCMS [M + 1] ⁺: 487.2. 12-15

¹H NMR (400 MHz, CD₃OD) δ = 8.94 (s, 1H), 7.68 (d, J = 8.0 Hz, 1H), 7.48(d, J = 7.8 Hz, 1H), 7.32 (s, 1H), 7.23 (t, J = 7.6 Hz, 1H), 5.67 (q, J= 6.8 Hz, 1H), 4.77-4.65 (m, 2H), 3.05-2.94 (m, 2H), 2.61-2.58 (m, 6H),2.57-2.48 (m, 1H), 2.03-1.97 (m, 2H), 1.60 (d, J = 6.8 Hz, 3H),1.55-1.43 (m, 2H). LCMS [M + 1] ⁺: 473.3. 12-16

¹H NMR (400 MHz, DMSO- d₆) δ = 9.15 (s, 1H), 7.68 (d, J = 8.0 Hz, 1H),7.54 (d, J = 7.6 Hz, 1H), 7.32 (t, J = 8.0 Hz, 1H), 7.28 (s, 1H), 5.35(q, J = 6.8 Hz, 1H), 4.30 (d, J = 8.4 Hz, 2H), 4.19 (d, J = 2.8, 9.2 Hz,2H), 3.34 (t, J = 6.8 Hz, 2H), 2.78 (s, 3H), 2.69 (s, 3H), 2.52 (s, 3H),2.41 (t, J = 6.8 Hz, 2H), 1.55 (d, J = 6.8 Hz, 3H). LCMS [M + 1] ⁺:485.1. 12-17

¹H NMR (400 MHz, CD₃OD) δ = 9.25 (br s, 1H), 7.83-7.70 (m, 1H), 7.55 (brd, J = 7.6 Hz, 1H), 7.46-7.18 (m, 2H), 5.57- 5.48 (m, 1H), 4.84-4.68 (m,1H), 4.55-4.27 (m, 3H), 4.07- 4.01 (m, 1H), 3.99-3.67 (m, 2H), 3.58-3.43(m, 1H), 3.03 (s, 3H), 2.79 (s, 3H), 2.71- 2.48 (m, 5H), 1.69 (d, J =7.2 Hz, 3H). LCMS [M + 1] ⁺: 471.2. 12-18

¹H NMR (400 MHz, CD₃OD) δ = 9.26 (s, 1H), 7.77 (t, J = 4.0 Hz, 2H), 7.55(d, J = 7.6 Hz, 1H), 7.31 (t, J = 8.0 Hz, 1H), 5.53 (q, J = 6.8 Hz, 1H),4.99- 4.92 (m, 2H), 3.46-3.36 (m, 2H), 2.89 (s, 6H), 2.80 (s, 3H), 2.64(s, 3H), 2.22 (br d, J = 12.4 Hz, 2H), 2.07-1.96 (m, 2H), 1.71 (d, J =6.8 Hz, 3H), 1.61 (s, 3H). LCMS [M + 1] ⁺: 487.2. 12-19

¹H NMR (400 MHz, DMSO- d₆) δ = 8.93 (s, 1H), 7.72 (d, J = 7.6 Hz, 1H),7.52 (d, J = 7.2 Hz, 1H), 7.45 (d, J = 6.8 Hz, 1H), 7.31 (t, J = 8.0 Hz,1H), 7.09 (s, 1H), 5.68-5.57 (m, 1H), 3.94 -3.86 (m, 2H), 3.80 (dd, J =3.2, 8.0 Hz, 2H), 2.55 (br s, 3H), 2.54 (s, 3H), 2.15 (s, 6H), 1.53 (d,J = 7.2 Hz, 3H), 1.32 (s, 3H). LCMS [M + 1] ⁺: 459.4. 12-20

¹H NMR (400 MHz, CD₃OD) δ = 9.27 (s, 1H), 7.71 (d, J = 7.2 Hz, 1H), 7.54(d, J = 7.6 Hz, 1H), 7.44 (s, 1H), 7.32-7.27 (m, 1H), 5.52 (q, J = 7.2Hz, 1H), 4.72-4.65 (m, 2H), 4.55 (m, 2H), 4.42 (br s, 1H), 3.01 (s, 6H),2.80 (s, 3H), 2.62 (s, 3H), 1.68 (d, J = 7.2 Hz, 3H). LCMS [M + 1] ⁺:445.2. 12-21

¹H NMR (400 MHz, DMSO- d₆) δ = 8.94 (s, 1H), 7.72 (d, J = 8.0 Hz, 1H),7.49 (dd, J = 7.6, 18.8 Hz, 2H), 7.31 (t, J = 8.0 Hz, 1H), 7.08 (s, 1H),5.71 (s, 1H), 5.62 (t, J = 6.8 Hz, 1H), 4.04-3.92 (m, 4H), 2.55 (s, 3H),2.54 (s, 3H), 1.54 (d, J = 6.8 Hz, 3H), 1.49 (s, 3H). LCMS [M + 1] ⁺:432.2. 12-22

¹H NMR (400 MHz, DMSO- d₆) δ = 14.76 (br s, 1H), 9.19 (s, 1H), 8.97 (brd, J = 3.6 Hz, 1H), 7.85 (d, J = 8.0 Hz, 1H), 7.60-7.53 (m, 2H), 7.35(t, J = 8.0 Hz, 1H), 5.42 (br t, J = 6.8 Hz, 1H), 4.76-4.68 (m, 1H),4.55-4.44 (m, 2H), 4.08-3.98 (m, 2H), 2.74 (s, 3H), 2.56 (s, 3H), 1.62(d, J = 7.2 Hz, 3H). LCMS [M + 1] ⁺: 418.1. 12-23

¹H NMR (400 MHz, DMSO- d₆) δ = 9.04 (s, 1H), 8.14 (s, 1H), 7.73 (d, J =7.6 Hz, 1H), 7.64-7.57 (m, 2H), 7.31 (t, J = 7.6 Hz, 1H), 7.26 (s, 1H),5.56- 5.52 m, 1H), 4.80 (d, J = 6.0 Hz, 2H), 3.91-3.87 (m, 2H),3.74-3.68 (m, 2H), 3.20 (d, J = 8.4 Hz, 2H), 2.66 (s, 3H), 2.57 (s, 3H),1.95 (d, J = 9.2 Hz, 1H), 1.55 (d, J = 7.2 Hz, 3H). LCMS [M + 1] ⁺:401.3. 12-24

¹H NMR (400 MHz, CD₃OD) δ = 9.10 (s, 1H), 8.47 (s, 1H), 7.70 (d, J = 7.6Hz, 1H), 7.52 (d, J = 7.6 Hz, 1H), 7.28 (t, J = 7.6 Hz, 1H), 7.20 (s,1H), 5.49- 5.43 (m, 1H), 5.24 (s, 1H), 4.85-4.83 (m, 1H), 4.83 (s, 2H),3.96 (d, J = 7.6 Hz, 1H), 3.85 (d, J = 7.6 Hz, 1H), 3.69 (d, J = 10.4Hz, 1H), 3.55 (d, J = 10.8 Hz, 1H), 2.71 (s, 3H), 2.71 (s, 3H), 2.09 (s,2H), 1.63 (d, J = 7.2 Hz, 3H). LCMS [M + 1] ⁺: 401.3. 12-25

¹H NMR (400 MHz, CD₃OD) δ = 9.30 (s, 1H), 7.87 (s, 1H), 7.82 (d, J = 7.2Hz, 1H), 7.55 (d, J = 6.8 Hz, 1H), 7.30 (t, J = 8.0 Hz, 1H), 7.34-7.26(m, 1H), 5.44 (q, J = 6.8 Hz, 1H), 4.35-4.26 (m, 4H), 3.49-3.40 (m, 4H),2.82 (s, 3H), 2.74 (s, 3H), 1.70 (d, J = 7.2 Hz, 3H). LCMS [M + 1] ⁺:388.2. 12-26

¹H NMR (400 MHz, DMSO- d₆) δ = 8.94 (s, 1H), 8.17 (s, 1H), 7.73 (d, J =8.0 Hz, 1H), 7.56-7.45 (m, 2H), 7.32 (t, J = 7.6 Hz, 1H), 7.11 (s, 1H),5.70- 5.58 (m, 1H), 4.88-4.69 (m, 1H), 3.86 (d, J = 11.2 Hz, 1H),3.05-2.99 (m, 2H), 2.93-2.85 (m, 1H), 2.56 (s, 3H), 2.54 (s, 3H), 2.43(s, 3H), 2.16-2.03 (m, 1H), 1.88-1.79 (m, 2H), 1.72-1.63 (m, 1H), 1.55(d, J = 6.8 Hz, 3H). LCMS [M + 1] ⁺: 471.2. 12-27

¹H NMR (400 MHz, CD₃OD) δ = 9.02 (s, 1H), 7.72 (d, J = 7.6 Hz, 1H), 7.51(dd, J = 1.2, 7.6 Hz, 1H), 7.34 (s, 1H), 7.27 (t, J = 8.0 Hz, 1H), 5.60(q, J = 6.8 Hz, 1H), 4.63 (br d, J = 13.6 Hz, 1H), 4.42 (br d, J = 12.8Hz, 1H), 3.94-3.83 (m, 2H), 3.75 (dt, J = 2.4, 11.6 Hz, 1H), 3.39 (t, J= 10.8 Hz, 1H), 3.18 (dt, J = 3.2, 12.8 Hz, 1H), 2.97 (br d, J = 11.6Hz, 1H), 2.81 (br d, J = 11.6 Hz, 1H), 2.77-2.71 (m, 3H), 2.71-2.66 (m,1H), 2.64 (s, 3H), 2.48- 2.32 (m, 3H), 1.63 (d, J = 6.8 Hz, 3H). LCMS[M + 1] ⁺: 444.2. 12-28

¹H NMR (400 MHz, CD₃OD) δ = 9.25 (s, 1H), 7.77 (d, J = 8.0 Hz, 1H), 7.72(s, 1H), 7.55 (d, J = 7.6 Hz, 1H), 7.33-7.27 (m, 1H), 5.43 (q, J = 6.8Hz, 1H), 5.12-5.01 (m, 2H), 3.72-3.59 (m, 1H), 3.24 (br t, J = 12.4 Hz,2H), 2.92 (s, 6H), 2.79 (s, 3H), 2.74 (s, 3H), 2.32 (br d, J = 11.6 Hz,2H), 1.89-1.75 (m, 2H), 1.68 (d, J = 6.8 Hz, 3H). LCMS [M + 1] ⁺: 430.3.12-29

¹H NMR (400 MHz, DMSO- d₆) δ = 14.94-14.58 (m, 1H), 11.66-11.25 (m, 1H),9.24 (s, 1H), 8.11 (s, 1H), 7.91 (d, J = 8.0 Hz, 1H), 7.65 (d, J = 7.6Hz, 1H), 7.36 (t, J = 8.0 Hz, 1H), 5.33 (t, J = 6.8 Hz, 1H), 4.90 (br d,J = 13.2 Hz, 2H), 4.21-3.92 (m, 4H), 3.55 (br s, 1H), 3.18 (br t, J =12.8 Hz, 2H), 2.74 (s, 3H), 2.67 (s, 3H), 2.44-2.19 (m, 2H), 2.08 (br d,J = 10 Hz, 2H), 1.64 (d, J = 6.8 Hz, 3H), 1.53-1.40 (m, 2H). LCMS [M +1] ⁺: 442.3. 12-30

¹H NMR (400 MHz, DMSO- d₆) δ = 14.80 (br s, 1H), 9.19 (s, 1H), 9.04 (brd, J = 3.6 Hz, 1H), 7.87 (d, J = 8.0 Hz, 1H), 7.69-7.59 (m, 2H),7.39-7.31 (m, 1H), 5.37-5.24 (m, 1H), 4.21-4.05 (m, 4H), 2.74 (s, 3H),2.66 (s, 3H), 1.62 (br d, J = 7.2 Hz, 3H), 1.49 (s, 3H). LCMS [M + 1] ⁺:389.2. 12-31

¹H NMR (400 MHz, DMSO- d₆) δ = 14.65 (s, 1H), 9.26 (s, 1H), 8.88 (s,1H), 7.88 (s, 1H), 7.82 (d, J = 8.0 Hz, 1H), 7.56 (d, J = 7.6 Hz, 1H),7.36 (t, J = 7.6 Hz, 1H), 5.47-5.37 (m, 1H), 4.94 (s, 2H), 3.79-3.61 (m,4H), 2.73 (s, 3H), 2.56 (s, 3H), 2.18-1.94 (m, 4H), 1.62 (d, J = 6.8 Hz,3H). LCMS [M + 1]⁺: 458.1. 12-32

¹H NMR (400 MHz, DMSO- d₆) δ 9.24 (s, 1H), 8.78 (s, 1H), 7.94 (s, 1H),7.76 (d, J = 7.9 Hz, 1H), 7.55 (d, J = 7.8 Hz, 1H), 7.49 (s, 1H), 7.34(t, J = 7.8 Hz, 1H), 5.46-5.35 (m, 1H), 4.40-4.14 (m, 5H), 3.23 (t, J =6.7 Hz, 2H), 2.72 (s, 3H), 2.54 (s, 3H), 1.59 (d, J = 6.9 Hz, 4H). LCMS[M + 1]⁺: 471.1. 12-33

¹H NMR (400 MHz, Methanol- d₄) δ 9.23 (s, 1H), 7.77-7.70 (m, 2H), 7.53(d, J = 7.8 Hz, 1H), 7.29 (t, J = 7.8 Hz, 1H), 5.51 (q, J = 6.9 Hz, 1H),5.04- 4.95 (m, 2H), 4.34-4.15 (m, 4H), 3.67 (d, J = 12.0 Hz, 1H), 3.25(t, J = 13.1 Hz, 2H), 2.78 (s, 3H), 2.70-2.59 (m, 4H), 2.47-2.35 (m,1H), 2.23 (d, J = 12.5 Hz, 2H), 1.68 (d, J = 6.9 Hz, 3H), 1.62-1.48 (m,2H). LCMS [M + 1]⁺: 485.2. 12-34

¹H NMR (400 MHz, Methanol- d₄) δ 9.06 (d, J = 0.8 Hz, 1H), 7.73 (dd, J =7.9, 1.3 Hz, 1H), 7.52 (dd, J = 7.7, 1.3 Hz, 1H), 7.48 (d, J = 0.9 Hz,1H), 7.28 (t, J = 7.8 Hz, 1H), 5.58 (q, J = 7.0 Hz, 1H), 4.03 (t, J =5.8 Hz, 5H), 2.75 (s, 3H), 2.66 (s, 3H), 2.11 (ddt, J = 19.0, 13.5, 5.7Hz, 5H), 1.64 (d, J = 7.0 Hz, 3H). LCMS [M + 1]⁺: 423.2. 12-35

¹H NMR (400 MHz, DMSO- d₆) δ 8.96 (s, 1H), 7.72 (d, J = 7.8 Hz, 1H),7.60 (dd, J = 7.6, 1.3 Hz, 1H), 7.49 (d, J = 6.8 Hz, 1H), 7.31 (t, J =7.8 Hz, 1H), 7.09 (s, 1H), 5.52 (q, J = 7.0 Hz, 1H), 4.19 (dd, J = 8.3,5.1 Hz, 2H), 4.05 (dd, J = 8.0, 1.7 Hz, 2H), 2.79 (s, 3H), 2.68- 2.64(m, 4H), 2.55 (s, 3H), 2.43 (t, J = 6.8 Hz, 2H), 2.33 (p, J = 1.8 Hz,1H), 1.53 (d, J = 7.0 Hz, 3H). LCMS [M + 1]⁺: 442.2. 12-36

¹H NMR (400 MHz, DMSO- d₆) δ 9.00 (s, 1H), 7.71 (dd, J = 8.0, 1.4 Hz,1H), 7.61 (dd, J = 7.6, 1.3 Hz, 1H), 7.55 (d, J = 6.8 Hz, 1H), 7.46 (s,1H), 7.36 (s, 1H), 7.32 (t, J = 7.8 Hz, 1H), 7.24 (d, J = 0.9 Hz, 1H),5.54 (q, J = 6.7 Hz, 1H), 3.85 (t, J = 5.2 Hz, 4H), 3.75 (s, 3H), 3.01(t, J = 5.2 Hz, 4H), 2.65 (s, 3H), 2.55 (s, 3H), 1.55 (d, J = 7.0 Hz,3H). LCMS [M + 1]⁺: 468.3. 12-37

¹H NMR (400 MHz, CDCl₃) δ 8.85 (s, 1H), 8.54 (s, 1H), 7.65 (d, J = 7.9Hz, 1H), 7.49 (d, J = 7.8 Hz, 1H), 7.18 (t, J = 7.8 Hz, 1H), 6.75 (s,1H), 5.57 (q, J = 6.8 Hz, 1H), 4.25-4.16 (m, 2H), 4.09-4.00 (m, 2H),3.32 (s, 3H), 2.64 (s, 3H), 2.52 (s, 3H), 1.64 (d, J = 6.8 Hz, 3H), 1.59(s, 3H). LCMS [M + 1]⁺: 446.4. 12-38

¹H NMR (400 MHz, CD₃OD) δ = 9.15 (s, 1H), 7.68 (d, J = 7.9 Hz, 1H), 7.54(d, J = 7.8 Hz, 1H), 7.29 (t, J = 7.8 Hz, 1H), 7.16 (s, 1H), 5.49 (q, J= 7.0 Hz, 1H), 4.37 (t, J = 7.7 Hz, 5H), 2.75 (s, 3H), 2.68-2.50 (m,5H), 1.65 (d, J = 7.0 Hz, 3H). LCMS [M + 1]⁺: 402.2. 12-39

¹H NMR (400 MHz, CD₃OD) δ = 9.15 (d, J = 0.8 Hz, 1H), 7.69- 7.65 (m,1H), 7.55-7.51 (m, 1H), 7.29 (t, J = 7.9 Hz, 1H), 7.17 (d, J = 0.8 Hz,1H), 5.49 (q, J = 6.9 Hz, 1H), 4.24-4.17 (m, 2H), 3.93 (dd, J = 9.6, 3.7Hz, 2H), 3.64 (s, 2H), 2.75 (s, 3H), 2.61 (d, J = 1.6 Hz, 3H), 1.65 (d,J = 7.0 Hz, 3H), 1.41 (s, 3H). LCMS [M + 1]⁺: 446.2. 12-40

¹H NMR (400 MHz, DMSO- d₆) δ = 8.94 (s, 1H), 8.16 (s, 1H), 7.72 (d, J =7.6 Hz, 1H), 7.62 (d, J = 7.6 Hz, 1H), 7.55- 7.50 (m, 1H), 7.32 (t, J =7.6 Hz, 1H), 7.09 (s, 1H), 5.55- 5.51 (m, 1H), 4.81-4.76 (m, 1H),3.86-3.83 (m, 1H), 3.47- 3.44 (m, 1H), 3.02-3.00 (m, 2H), 2.90-2.85 (m,1H), 2.66 (s, 3H), 2.54 (s, 3H), 2.41 (s, 3H), 2.12-2.07 (m, 1H), 1.90-1.82 (m, 2H), 1.71-1.64 (m, 1H), 1.54 (d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 428.4. 12-41

¹H NMR (400 MHz, CD₃OD) δ 9.02 (d, J = 0.9 Hz, 1H), 8.22 (dd, J = 5.0,1.7 Hz, 1H), 7.83 (dd, J = 7.9, 1.7 Hz, 1H), 7.31 (d, J = 1.0 Hz, 1H),7.18 (dd, J = 7.9, 4.9 Hz, 1H), 5.59-5.53 (m, 1H), 3.86-3.81 (m, 4H),3.79-3.73 (m, 4H), 2.72 (s, 3H), 2.63 (s, 3H), 1.63 (d, J = 7.0 Hz, 3H).LCMS [M + 1] ⁺: 365.3. 12-42

¹H NMR (400 MHz, DMSO- d₆): δ = 8.96 (s, 1H), 8.19 (s, 1H), 7.58 (d, J =7.6 Hz, 1H), 7.45 (d, J = 7.2 Hz, 1H), 7.40 (s, 1H), 7.39-7.33 (m, 1H),7.29-7.05 (m, 2H), 5.65-5.61 (m, 1H), 4.51-4.26 (m, 2H), 3.83-3.77 (m,2H), 3.58-3.56 (m, 1H), 3.23 (t, J = 10.8, 1H), 3.06 (dt, J = 12.4, 2.8Hz, 1H), 2.91 (d, J = 11.2 Hz, 1H), 2.72 (d, J = 11.2 Hz, 1H), 2.61-2.56 (m, 1H), 2.54 (s, 3H), 2.48 (s, 3H), 2.29-2.24 (m, 3H), 1.53 (d, J= 6.8 Hz, 3H). LCMS [M + 1] ⁺: 469.2. 12-43

¹H NMR (400 MHz, CD₃OD) δ = 9.26 (s, 1H), 7.79 (d, J = 8.0 Hz, 1H), 7.55(d, J = 7.6 Hz, 1H), 7.49 (s, 1H), 7.30 (t, J = 8.0 Hz, 1H), 5.43 (q, J= 7.2 Hz, 1H), 4.64 (br dd, J = 4.4, 10.4 Hz, 2H), 4.35 (dd, J = 4.4,10.4 Hz, 2H), 2.94 (s, 6H), 2.81 (s, 3H), 2.73 (s, 3H), 1.82 (s, 3H),1.69 (d, J = 6.8 Hz, 3H). LCMS [M + 1] ⁺: 416.2. 12-44

¹H NMR (400 MHz, CD₃OD) δ = 9.02 (s, 1H), 7.73 (d, J = 7.6 Hz, 1H), 7.51(d, J = 8.0 Hz, 1H), 7.36 (s, 1H), 7.27 (t, J = 8.0 Hz, 1H), 5.59 (q, J= 7.2 Hz, 1H), 3.85 (s, 4H), 2.75 (s, 3H), 2.68-2.56 (m, 7H), 2.40 (s,3H), 1.63 (d, J = 6.8 Hz, 3H). LCMS [M + 1] ⁺: 402.3. 12-45

¹H NMR (400 MHz, CD₃OD) δ = 8.96 (s, 1H), 7.72 (d, J = 8.0 Hz, 1H), 7.49(d, J = 7.6 Hz, 1H), 7.25 (t, J = 7.6 Hz, 1H), 7.12 (s, 1H), 5.58 (q, J= 7.2 Hz, 1H), 3.27 (s, 6H), 2.73 (s, 3H), 2.60 (br s, 3H), 1.62 (d, J =6.8 Hz, 3H). LCMS [M + 1] ⁺: 347.2. 12-46

¹H NMR (400 MHz, CD₃OD) δ = 8.99 (s, 1H), 7.73 (d, J = 7.6 Hz, 1H), 7.51(d, J = 7.6 Hz, 1H), 7.33 (s, 1H), 7.27 (t, J = 7.6 Hz, 1H), 5.60 (q, J= 6.8 Hz, 1H), 4.27 (br d, J = 13.2 Hz, 2H), 3.45 (ddd, J = 4.4, 8.8,13.2 Hz, 2H), 2.75 (s, 3H), 2.63 (s, 3H), 2.31 (s, 6H), 1.85- 1.71 (m,4H), 1.63 (d, J = 7.2 Hz, 3H), 1.15 (s, 3H). LCMS [M + 1] ⁺: 444.5.12-47

¹H NMR (400 MHz, DMSO- d₆): δ = 8.95 (s, 1H), 7.44- 7.38 (m, 1H), 7.36(d, J = 7.6 Hz, 1H), 7.23-7.12 (m, 1H), 7.06 (s, 1H), 7.01-6.93 (m, 1H),5.71 (s, 1H), 5.62-5.52 (m, 1H), 4.05-3.90 (m, 4H), 2.54 (s, 3H), 1.55(d, J = 7.2 Hz, 3H), 1.49 (s, 3H). LCMS [M + 1]⁺: 386.1. 12-48

¹H NMR (400 MHz, DMSO- d₆): δ = 8.99 (s, 1H), 8.15 (s, 1H), 7.47-7.31(m, 3H), 7.25- 7.12 (m, 1H), 7.04-6.91 (m, 1H), 5.59 (t, J = 6.8 Hz,1H), 4.49-4.31 (m, 2H), 3.88-3.74 (m, 2H), 3.61-3.54 (m, 1H), 3.24-3.21(m, 1H), 3.12-3.04 (m, 1H), 2.92 (d, J = 10.8 Hz, 1H), 2.73 (d, J = 11.6Hz, 1H), 2.63-2.57 (m, 1H), 2.57-2.53 (m, 3H), 2.29-2.15 (m, 3H), 1.57(d, J = 7.2 Hz, 3H). LCMS [M + 1] ⁺: 441.4. 12-49

¹H NMR (400 MHz, DMSO- d₆): δ = 8.95 (s, 1H), 8.16 (s, 1H), 7.45-7.32(m, 2H), 7.22- 7.14 (m, 1H), 7.08 (s, 1H), 7.01- 6.93 (m, 1H), 5.57 (t,J = 6.8 Hz, 1H), 3.93-3.86 (m, 2H), 3.79 (d, J = 8.0 Hz, 2H), 2.55 (s,3H), 2.15 (s, 6H), 1.56 (d, J = 7.2 Hz, 3H), 1.32 (s, 3H). LCMS [M + 1]⁺: 413.4. 12-50

¹H NMR (400 MHz, CD₃OD) δ = 9.03 (d, J = 0.8 Hz, 1H), 7.65 (t, J = 6.8Hz, 1H), 7.51 (t, J = 7.2 Hz, 1H), 7.37 (s, 1H), 7.21 (t, J = 7.6 Hz,1H), 5.68 (q, J = 7.2 Hz, 1H), 3.88-3.83 (m, 4H), 3.81-3.76 (m, 4H),2.62 (s, 3H), 1.68 (d, J = 7.2 Hz, 3H). LCMS [M + 1]⁺: 436.2. 12-51

¹H NMR (400 MHz, CD₃OD) δ = 8.92 (s, 1H), 7.70 (d, J = 8.0 Hz, 1H), 7.49(d, J = 8.0 Hz, 1H), 7.29-7.21 (m, 1H), 7.00 (s, 1H), 5.57 (q, J = 6.8Hz, 1H), 4.21-4.14 (m, 2H), 4.14- 4.06 (m, 2H), 2.88 (s, 2H), 2.75 (s,3H), 2.69 (t, J = 7.2 Hz, 2H), 2.61 (s, 3H), 2.41 (s, 3H), 2.25 (t, J =7.2 Hz, 2H), 1.61 (d, J = 7.2 Hz, 3H). LCMS [M + 1]⁺: 428.2. 12-52

¹H NMR (400 MHz, CD₃OD) δ = 9.30 (s, 1H), 7.91 (s, 1H), 7.83 (d, J = 7.6Hz, 1H), 7.55 (d, J = 7.6 Hz, 1H), 7.30 (t, J = 8.0 Hz, 1H), 5.44 (q, J= 6.8 Hz, 1H), 5.08 (br d, J = 14.4 Hz, 2H), 3.80 (br d, J = 12.0 Hz,2H), 3.63 (br t, J = 12.8 Hz, 2H), 3.33 (s, 2H), 3.24 (br s, 2H), 2.82(s, 3H), 2.74 (s, 3H), 1.70 (d, J = 6.8 Hz, 3H), 1.45 (t, J = 7.2 Hz,3H). LCMS [M + 1] ⁺: 416.2. 12-53

¹H NMR (400 MHz, CD₃OD) δ = 8.95 (s, 1H), 7.70 (d, J = 7.6 Hz, 1H), 7.48(d, J = 6.8 Hz, 1H), 7.31 (s, 1H), 7.24 (t, J = 8.0 Hz, 1H), 5.61-5.49(m, 1H), 4.23-4.13 (m, 2H), 3.63- 3.52 (m, 2H), 2.72 (s, 3H), 2.59 (s,3H), 1.73-1.64 (m, 4H), 1.60 (d, J = 6.8 Hz, 3H), 1.28 (s, 3H). LCMS[M + 1] ⁺: 417.3. 12-54

¹H NMR (400 MHz, CD₃OD) δ = 9.26 (s, 1H), 7.80 (d, J = 7.2 Hz, 1H),7.57-7.52 (m, 1H), 7.50 (s, 1H), 7.30 (t, J = 8.0 Hz, 1H), 5.43 (q, J =6.8 Hz, 1H), 4.77-4.63 (m, 2H), 4.62- 4.51 (m, 2H), 4.44 (tt, J = 4.8,7.6 Hz, 1H), 3.00 (s, 6H), 2.81 (s, 3H), 2.73 (s, 3H), 1.69 (d, J = 6.8Hz, 3H). LCMS [M + 1]⁺: 402.2. 12-55

¹H NMR (400 MHz, CD₃OD) δ = 9.18 (s, 1H), 7.71 (d, J = 7.2 Hz, 1H), 7.55(d, J = 6.8 Hz, 1H), 7.30 (t, J = 7.6 Hz, 1H), 7.21 (s, 1H), 5.40 (q, J= 6.8 Hz, 1H), 4.25 (dd, J = 2.8, 9.8 Hz, 2H), 4.13 (dd, J = 1.6, 10.0Hz, 2H), 3.35 (s, 3H), 2.77 (s, 3H), 2.73 (s, 3H), 1.65 (d, J = 7.2 Hz,3H), 1.62 (s, 3H). LCMS [M + 1] ⁺: 403.2. 12-56

¹H NMR (400 MHz, DMSO- d₆) δ = 8.95 (s, 1H), 7.42 (d, J = 6.8 Hz, 1H),7.27-7.17 (m, 2H), 7.14-7.05 (m, 2H), 5.71 (s, 1H), 5.65-5.58 (m, 1H),4.05-3.94 (m, 4H), 2.55 (s, 3H), 1.60 (d, J = 6.8 Hz, 3H), 1.49 (s, 3H).LCMS [M + 1] ⁺: 386.0. 12-57

¹H NMR (400 MHz, CD₃OD) δ = 8.92 (s, 1H), 7.41 (dd, J = 6.0, 8.4 Hz,1H), 7.01 (s, 1H), 6.90-6.77 (m, 2H), 5.56 (q, J = 6.8 Hz, 1H),4.12-3.98 (m, 4H), 2.63 (s, 3H), 2.47 (s, 3H), 1.62-1.55 (m, 6H). LCMS[M + 1] ⁺: 382.1. 12-58

¹H NMR (400 MHz, DMSO-d₆) δ = 9.05 (s, 1H), 7.49-7.38 (m, 3H), 7.26 (s,2H), 7.21-7.15 (m, 1H), 6.98 (t, J = 8.7 Hz, 1H), 5.62 (t, J = 7.0 Hz,1H), 4.84-4.78 (m, 2H), 3.93-3.86 (m, 2H), 3.79- 3.69 (m, 2H), 3.24-3.17(m, 1H), 2.58 (s, 3H), 1.95 (d, J = 8.8 Hz, 1H), 1.58 (d, J = 7.1 Hz,3H). LCMS [M + 1] ⁺: 398.1. 12-59

¹H NMR (400 MHz, DMSO- d₆) δ 8.99 (s, 1H), 7.62-7.18 (m, 7H), 5.64 (t, J= 6.9 Hz, 1H), 3.88-3.81 (m, 4H), 3.75 (s, 3H), 3.04-2.97 (m, 4H), 2.55(s, 3H), 1.54 (d, J = 6.9 Hz, 3H). LCMS [M + 1] ⁺: 493.3. 12-60

¹H NMR (400 MHz, DMSO-d₆) δ = 8.94 (s, 1H), 7.69 (t, J = 7.2 Hz, 1H),7.61 (t, J = 7.2 Hz, 1H), 7.47 (d, J = 7.0 Hz, 1H), 7.31 (t, J = 7.8 Hz,1H), 7.11 (s, 1H), 5.70-5.59 (m, 1H), 3.84 (d, J = 11.2 Hz, 1H), 3.45(d, J = 11.1 Hz, 1H), 3.00-2.77 (m, 4H), 2.37 (s, 3H), 2.13-1.96 (m,2H), 1.87-1.79 (m, 2H), 1.61 (d, J = 7.0 Hz, 3H). LCMS [M + 1] ⁺: 475.0.12-61

¹H NMR (400 MHz, DMSO-d₆) δ = 8.96 (s, 1H), 7.69 (t, J = 7.3 Hz, 1H),7.61 (t, J = 7.2 Hz, 1H), 7.48 (d, J = 7.0 Hz, 1H), 7.30 (t, J = 7.8 Hz,1H), 7.08 (s, 1H), 5.67-5.59 (m, 1H), 4.05-3.93 (m, 4H), 2.54 (s, 3H),1.60 (d, J = 7.0 Hz, 3H), 1.50 (s, 3H). LCMS [M + 1] ⁺: 436.1. 12-62

¹H NMR (400 MHz, DMSO-d₆) δ 9.08 (s, 1H), 7.90 (s, 1H), 7.73 (t, J = 7.4Hz, 1H), 7.64 (t, J = 7.3 Hz, 1H), 7.33 (t, J = 7.8 Hz, 1H), 7.21 (s,1H), 5.63-5.54 (m, 1H), 4.06 (d, J = 9.0 Hz, 2H), 3.91 (d, J = 8.8 Hz,2H), 2.62 (s, 3H), 2.29 (s, 6H), 1.63 (d, J = 7.0 Hz, 3H), 1.41 (s, 3H).LCMS [M + 1] ⁺: 463.3. 12-63

¹H NMR (400 MHz, Methanol-d₄) δ 9.02 (s, 1H), 7.65 (t, J = 7.4 Hz, 1H),7.51 (t, J = 7.2 Hz, 1H), 7.37 (s, 1H), 7.21 (t, J = 7.8 Hz, 1H), 5.68(q, J = 7.1 Hz, 1H), 4.63 (d, J = 13.3 Hz, 1H), 4.43 (d, J = 12.8 Hz,1H), 3.93-3.71 (m, 3H), 3.38 (t, J = 10.7 Hz, 1H), 3.24-3.11 (m, 1H),2.97 (d, J = 11.4 Hz, 1H), 2.80 (d, J = 11.6 Hz, 1H), 2.71 (t, J = 11.7Hz, 1H), 2.62 (s, 3H), 2.47-2.33 (m, 3H), 1.68 (d, J = 7.0 Hz, 3H). LCMS[M + 1] ⁺: 491.4. 12-64

¹H NMR (400 MHz, DMSO-d₆) δ = 8.99 (s, 1H), 7.70 (t, J = 7.4 Hz, 1H),7.62 (t, J = 7.3 Hz, 1H), 7.57 (d, J = 6.8 Hz, 1H), 7.47 (s, 1H), 7.31(t, J = 7.7 Hz, 1H), 5.69- 5.60 (m, 1H), 4.64 (d, J = 13.2 Hz, 2H), 3.02(t, J = 12.6 Hz, 2H), 2.88-2.75 (m, 1H), 2.55 (s, 3H), 2.41 (s, 6H),2.04-1.94 (m, 2H), 1.62 (d, J = 7.0 Hz, 3H), 1.49 (q, J = 12.4 Hz, 2H).LCMS [M + 1] ⁺: 477.3. 12-65

¹H NMR (400 MHz, DMSO- d₆) δ 9.02 (s, 1H), 7.70 (t, J = 7.4 Hz, 1H),7.62 (t, J = 7.2 Hz, 1H), 7.56 (s, 1H), 7.48 (s, 1H), 7.31 (t, J = 7.8Hz, 1H), 5.69- 5.60 (m, 1H), 3.85-3.77 (m, 4H), 3.10-3.02 (m, 4H), 2.56(s, 3H), 1.62 (d, J = 7.0 Hz, 3H). LCMS [M + 1] ⁺: 435.3. 12-66

¹H NMR (400 MHz, DMSO- d₆) δ = 8.96 (s, 1H), 7.70 (t, J = 7.4 Hz, 1H),7.61 (t, J = 7.3 Hz, 1H), 7.48 (d, J = 6.9 Hz, 1H), 7.30 (t, J = 7.8 Hz,1H), 7.10 (s, 1H), 5.68-5.59 (m, 1H), 4.21-4.13 (m, 2H), 3.94- 3.86 (m,2H), 2.55 (s, 2H), 2.16 (s, 5H), 1.60 (d, J = 7.0 Hz, 3H). LCMS [M + 1]⁺: 449.3. 12-67

¹H NMR (400 MHz, CD₃OD) δ = 9.12 (s, 1H), 8.47 (s, 1H), 7.68 (t, J = 7.3Hz, 1H), 7.54 (t, J = 7.3 Hz, 1H), 7.47 (s, 1H), 7.24 (t, J = 7.8 Hz,1H), 5.61 (q, J = 7.0 Hz, 1H), 3.95 (t, J = 5.2 Hz, 4H), 2.69 (d, J =2.9 Hz, 7H), 2.44 (s, 3H), 1.70 (d, J = 7.0 Hz, 3H). LCMS [M + 1] ⁺:449.0. 12-68

¹H NMR (400 MHz, CD₃OD) δ = 9.10 (s, 1H), 7.69 (t, J = 7.4 Hz, 1H), 7.55(t, J = 7.2 Hz, 1H), 7.44 (s, 1H), 7.25 (t, J = 7.8 Hz, 1H), 5.66 (q, J= 7.0 Hz, 1H), 3.93 (t, J = 5.2 Hz, 4H), 2.73 (t, J = 5.2 Hz, 4H), 2.68(s, 3H), 2.61 (q, J = 7.2 Hz, 2H), 1.71 (d, J = 7.0 Hz, 3H), 1.22 (t, J= 7.2 Hz, 3H). LCMS [M + 1] ⁺: 463.0. 12-69

¹H NMR (400 MHz, CD₃OD) δ 8.95 (d, J = 0.8 Hz, 1H), 7.71 (dd, J = 8.0,1.4 Hz, 1H), 7.50 (d, J = 1.4 Hz, 0H), 7.24 (t, J = 7.8 Hz, 1H), 7.01(s, 1H), 5.58 (q, J = 6.9 Hz, 1H), 3.97-3.83 (m, 3H), 3.61-3.49 (m, 1H),3.41-3.34 (m, 1H), 3.31 (s, 9H), 3.04-2.97 (m, 1H), 2.72 (s, 3H), 2.61(s, 3H), 2.43- 2.32 (m, 7H), 2.05-1.93 (m, 1H), 1.62 (d, J = 6.9 Hz,4H). LCMS [M + 1] ⁺: 416.3. 12-70

¹H NMR (400 MHz, CD₃OD) δ = 9.17-9.14 (m, 1H), 7.74 (dd, J = 7.8, 1.3Hz, 1H), 7.54 (dd, J = 7.7, 1.3 Hz, 1H), 7.31- 7.25 (m, 2H), 5.47 (q, J= 6.9 Hz, 1H), 5.09 (s, 1H), 4.09 (d, J = 12.4 Hz, 1H), 3.71 (d, J =12.4 Hz, 1H), 3.64 (t, J = 5.3 Hz, 2H), 3.57 (br s, 2H), 3.39 (s, 3H),3.23-3.08 (m, 3H), 2.33 (d, J = 9.1 Hz, 1H), 2.03 (t, J = 8.3 Hz, 2H),1.93-1.83 (m, 1H), 1.66 (d, J = 7.0 Hz, 3H). LCMS [M + 1] ⁺: 472.3.12-71

¹H NMR (400 MHz, DMSO- d₆) δ = 14.73 (s, 1H), 9.24 (d, J = 2.7 Hz, 1H),8.88 (s, 1H), 7.80 (d, J = 8.2 Hz, 1H), 7.66 (d, J = 7.6 Hz, 1H), 7.52(s, 1H), 7.41-7.32 (m, 1H), 5.34- 5.29 (m, 1H), 4.27 (s, 4H), 3.92-3.87(m, 2H), 3.83- 3.74 (m, 2H), 2.74 (s, 3H), 2.66 (s, 3H), 2.29-2.21 (m,2H), 1.60 (d, J = 7.1, 3H). LCMS [M + 1] ⁺: 415.2. 12-72

¹H NMR (400 MHz, CD₃OD) δ 9.06 (s, 1H), 8.49 (s, 1H), 7.72 (dd, J = 7.9,1.3 Hz, 1H), 7.51 (dd, J = 7.7, 1.3 Hz, 1H), 7.27 (t, J = 7.8 Hz, 1H),7.15 (s, 1H), 5.50 (q, J = 6.9 Hz, 1H), 4.38 (d, J = 10.0 Hz, 2H), 3.89(dd, J = 10.0, 2.9 Hz, 2H), 3.82- 3.73 (m, 4H), 2.71 (s, 3H), 2.69 (s,3H), 2.65-2.58 (m, 2H), 2.50 (s, 3H), 1.63 (d, J = 7.0 Hz, 3H). LCMS[M + 1] ⁺: 444.2. 12-73

¹H NMR (400 MHz, Methanol-d₄) δ 8.99 (d, J = 0.9 Hz, 1H), 7.70 (dd, J =7.9, 1.4 Hz, 1H), 7.49 (dd, J = 7.7, 1.4 Hz, 1H), 7.34 (d, J = 1.0 Hz,1H), 7.24 (t, J = 7.8 Hz, 1H), 5.57 (q, J = 6.9 Hz, 1H), 4.71 (d, J =12.4 Hz, 1H), 4.62 (d, J = 13.4 Hz, 1H), 3.24-3.07 (m, 3H), 2.85-2.72(m, 2H), 2.72 (s, 3H), 2.61 (s, 3H), 2.41-2.13 (m, 3H), 2.06-1.91 (m,1H), 1.94-1.83. (m, 1H), 1.61 (d, J = 6.9 Hz, 3H), 1.61-1.48 (m, 1H).LCMS [M + 1] ⁺: 428.2. 12-74

¹H NMR (400 MHz, CD₃OD) δ = 9.13 (s, 1H), 8.45 (s, 1H), 7.47 (s, 1H),7.30-7.23 (m, 1H), 7.26-7.16 (m, 1H), 7.13- 7.04 (m, 1H), 5.62 (q, J =7.0 Hz, 1H), 4.72 (d, J = 13.3 Hz, 1H), 4.54-4.47 (m, 1H), 3.92- 3.80(m, 2H), 3.79-3.68 (m, 1H), 3.37 (t, J = 10.6 Hz, 1H), 3.31-3.20 (m,1H), 3.02- 2.93 (m, 1H), 2.83-2.72 (m, 2H), 2.70 (s, 3H), 2.46-2.35 (m,2H), 2.39-2.28 (m, 1H), 1.65 (d, J = 7.0 Hz, 3H). LCMS [M + 1] ⁺: 457.2.12-75

¹H NMR (400 MHz, DMSO-d₆) δ = 8.99 (s, 1H), 7.47 (d, J = 7.1 Hz, 1H),7.41 (s, 1H), 7.30-7.15 (m, 2H), 7.14-7.04 (m, 1H), 5.67- 5.59 (m, 1H),4.44 (d, J = 12.5 Hz, 1H), 4.37 (d, J = 12.4 Hz, 1H), 3.86-3.76 (m, 2H),3.63-3.52 (m, 1H), 3.29-3.19 (m, 1H), 3.14- 3.02 (m, 1H), 2.92 (d, J =11.5 Hz, 1H), 2.73 (d, J = 11.3 Hz, 1H), 2.64-2.57 (m, 1H), 2.56 (s,3H), 2.36-2.18 (m, 3H), 1.60 (d, J = 7.0 Hz, 3H). LCMS [M + 1] ⁺: 441.1.12-76

¹H NMR (400 MHz, DMSO- d₆) δ = 8.93 (s, 1H), 7.72 (d, J = 8.0 Hz, 1H),7.61 (d, J = 7.5 Hz, 1H), 7.47 (d, J = 6.8 Hz, 1H), 7.31 (t, J = 7.8 Hz,1H), 7.08 (s, 1H), 5.57-5.46 (m, 1H), 3.78 (d, J = 11.2 Hz, 1H),3.56-3.44 (m, 1H), 3.24- 3.07 (m, 4H), 2.65 (s, 3H), 2.52 (s, 3H),2.13-1.97 (m, 1H), 1.93-1.78 (m, 2H), 1.76- 1.67 (m, 2H), 1.54 (d, J =6.9 Hz, 3H). LCMS [M + 1] ⁺: 496.0. 12-77

¹H NMR (400 MHz, CD₃OD) δ = 9.17 (s, 1H), 8.51 (s, 1H), 7.35 (s, 1H),7.33-7.27 (m, 1H), 7.27-7.17 (m, 1H), 7.14- 7.05 (m, 1H), 5.68 (q, J =6.9 Hz, 1H), 4.87 (s, 2H), 4.02 (d, J = 13.0 Hz, 2H), 3.88 (d, J = 12.8Hz, 2H), 3.42-3.34 (m, 1H), 2.72 (s, 3H), 2.07-2.00 (m, 1H), 1.68 (d, J= 7.0 Hz, 3H). LCMS [M + 1] ⁺: 414.2. 12-78

¹H NMR (400 MHz, DMSO- d₆) δ = 8.97 (s, 1H), 7.71 (d, J = 8.0 Hz, 1H),7.61 (d, J = 7.7 Hz, 1H), 7.58-7.52 (m, 1H), 7.32 (t, J = 7.8 Hz, 1H),7.08 (s, 1H), 5.48 (q, J = 6.9 Hz, 1H), 4.11-4.01 (m, 4H), 3.32- 3.25(m, 2H), 3.00 (s, 2H), 2.80 (t, J = 7.1 Hz, 2H), 2.64 (s, 3H), 2.55 (s,3H), 2.13 (t, J = 7.0 Hz, 2H), 1.53 (d, J = 6.9 Hz, 3H). LCMS [M + 1] ⁺:496.4. 12-79

¹H NMR (400 MHz, CD₃OD) δ = 9.25 (s, 1H), 7.59 (s, 1H), 7.43 (dd, J =8.6, 5.8 Hz, 1H), 6.95-6.84 (m, 2H), 5.40 (q, J = 7.0 Hz, 1H), 3.98-3.69(m, 3H), 3.51-3.37 (m, 4H), 3.22- 2.86 (m, 3H), 2.81 (s, 3H), 2.68-2.53(m, 3H), 2.50 (s, 3H), 1.65 (d, J = 6.9 Hz, 3H). LCMS [M + 1] ⁺: 437.3.12-80

¹H NMR (400 MHz, CD₃OD) δ = 9.06 (d, J = 0.8 Hz, 1H), 8.48 (s, 1H),7.29-7.16 (m, 2H), 7.15-7.10 (m, 1H), 7.13- 7.04 (m, 1H), 5.63 (q, J =6.9 Hz, 1H), 4.21-4.14 (m, 2H), 4.14-4.08 (m, 2H), 2.68 (s, 3H), 1.65(d, J = 7.0 Hz, 3H), 1.60 (s, 3H). LCMS [M + 1] ⁺: 402.2. 12-81

¹H NMR (400 MHz, CD₃OD) δ = 8.94-8.89 (m, 1H), 7.22 (d, J = 7.7 Hz, 1H),7.13-7.00 (m, 2H), 6.86 (t, J = 8.9 Hz, 1H), 5.58 (q, J = 6.9 Hz, 1H),4.13-4.07 (m, 2H), 4.07- 4.01 (m, 2H), 2.62 (s, 3H), 2.37 (s, 3H),1.62-1.56 (m, 6H). LCMS [M + 1] ⁺: 382.3. 12-82

¹H NMR (400 MHz, DMSO- d₆) δ = 14.91 (s, 1H), 12.41 (s, 1H), 9.12 (s,1H), 8.90 (s, 1H), 7.67 (s, 1H), 7.22 (d, J = 7.8 Hz, 1H), 7.08-6.98 (m,1H), 6.86 (t, J = 9.0 Hz, 1H), 5.23- 5.11 (m, 1H), 4.54-4.46 (m, 2H),4.06-4.01 (m, 2H), 2.64 (s, 3H), 2.57 (s, 6H), 2.20 (s, 3H), 1.56 (s,3H), 1.47 (d, J = 6.9 Hz, 3H). LCMS [M + 1] ⁺: 409.2. 12-83

¹H NMR (400 MHz, DMSO- d₆) δ = 8.97 (s, 1H), 8.14 (s, 1H), 7.45 (s, 1H),7.30-7.16 (m, 2H), 7.13-7.06 (m, 2H), 5.63-5.59 (m, 1H), 3.91 (dd, J =8.2, 4.3 Hz, 2H), 3.85-3.78 (m, 2H), 2.56 (s, 3H), 2.16 (s, 6H), 1.60(d, J = 7.0 Hz, 3H), 1.33 (s, 3H). LCMS [M + 1] ⁺: 413.1. 12-84

¹H NMR (400 MHz, CD₃OD) δ 9.19 (s, 1H), 7.44 (dd, J = 8.6, 5.9 Hz, 1H),7.34 (s, 1H), 6.93- 6.80 (m, 2H), 5.48 (q, J = 6.9 Hz, 1H), 4.85 (s,2H), 4.02 (d, J = 13.0 Hz, 2H), 3.88 (d, J = 12.9 Hz, 2H), 3.41-3.33 (m,1H), 2.76 (s, 3H), 2.49 (s, 3H), 2.02 (d, J = 9.1 Hz, 1H), 1.64 (d, J =6.9 Hz, 3H). LCMS [M + 1] ⁺: 394.3. 12-85

¹H NMR (400 MHz, CD₃OD) δ = 9.03 (d, J = 0.8 Hz, 1H), 7.30- 7.23 (m,1H), 7.25-7.15 (m, 1H), 7.12 (s, 1H), 7.12-7.03 (m, 1H), 5.65 (q, J =7.0 Hz, 1H), 4.09 (d, J = 8.9 Hz, 2H), 3.95 (d, J = 8.8 Hz, 2H), 2.66(s, 3H), 2.30 (s, 6H), 1.65 (d, J = 6.9 Hz, 3H), 1.47 (s, 3H). LCMS [M +1] ⁺: 429.2. 12-86

¹H NMR (400 MHz, CD₃OD) δ = 9.09 (s, 1H), 7.72 (d, J = 8.0 Hz, 1H), 7.53(d, J = 7.7 Hz, 1H), 7.41 (s, 1H), 7.28 (t, J = 7.8 Hz, 1H), 5.54 (q, J= 7.0 Hz, 1H), 4.70 (d, J = 13.2 Hz, 1H), 4.51 (d, J = 13.2 Hz, 1H),3.28-3.16 (m, 1H), 3.04- 2.96 (m, 2H), 2.84 (dd, J = 13.2, 10.7 Hz, 1H),2.74 (s, 3H), 2.69 (s, 3H), 2.41 (td, J = 12.0, 3.3 Hz, 1H), 2.27-2.13(m, 2H), 1.92-1.85 (m, 1H), 1.83-1.69 (m, 3H), 1.64 (d, J = 7.0 Hz, 3H),1.50-1.33 (m, 2H). LCMS [M + 1] ⁺: 442.3. 12-87

¹H NMR (400 MHz, CD₃OD) δ = 9.04 (d, J = 0.9 Hz, 1H), 8.51 (s, 1H), 7.72(dd, J = 7.9, 1.4 Hz, 1H), 7.52 (dd, J = 7.7, 1.4 Hz, 1H), 7.28 (t, J =7.8 Hz, 1H), 7.08 (s, 1H), 5.52 (q, J = 6.9 Hz, 1H), 4.12-4.04 (m, 2H),3.95- 3.87 (m, 2H), 3.78-3.71 (m, 4H), 2.72 (s, 3H), 2.68 (s, 3H),2.61-2.49 (m, 4H), 1.63 (d, J = 7.0 Hz, 3H), 1.47 (s, 3H). LCMS [M + 1]⁺: 458.3. 12-88

¹H NMR (400 MHz, CD₃OD) δ = 8.95 (d, J = 0.9 Hz, 1H), 7.72 (dd, J = 7.9,1.4 Hz, 1H), 7.50 (dd, J = 7.7, 1.3 Hz, 1H), 7.26 (t, J = 7.8 Hz, 1H),7.05 (d, J = 0.9 Hz, 1H), 5.58 (q, J = 6.9 Hz, 1H), 4.34 (dd, J = 9.2,3.3 Hz, 2H), 3.99 (d, J = 9.2 Hz, 2H), 2.82 (t, J = 7.3 Hz, 2H), 2.73(s, 3H), 2.62 (s, 3H), 2.51 (s, 3H), 2.26-2.18 (m, 2H), 1.94-1.82 (m,2H), 1.62 (d, J = 6.9 Hz, 3H). LCMS [M + 1] ⁺: 428.2. 12-89

¹H NMR (400 MHz, CD₃OD) δ 9.19 (s, 1H), 7.76 (dd, J = 7.9, 1.4 Hz, 1H),7.54 (dd, J = 7.8, 1.3 Hz, 1H), 7.35 (s, 1H), 7.29 (t, J = 7.8 Hz, 1H),5.47 (q, J = 6.9 Hz, 1H), 5.15 (s, 1H), 4.14 (dt, J = 12.8, 2.7 Hz, 1H),3.85- 3.68 (m, 4H), 3.45-3.41 (m, 2H), 3.27-3.12 (m, 2H), 2.76 (s, 3H),2.73 (s, 3H), 2.39- 2.34 (m, 1H), 2.11-2.02 (m, 2H), 2.00-1.88 (m, 1H),1.67 (d, J = 7.0 Hz, 3H). LCMS [M + 1] ⁺: 458.2. 12-90

¹H NMR (400 MHz, CD₃OD) δ = 8.97 (d, J = 0.8 Hz, 1H), 7.72 (dd, J = 8.0,1.4 Hz, 1H), 7.48 (dd, J = 7.7, 1.4 Hz, 1H), 7.30 (d, J = 0.9 Hz, 1H),7.24 (t, J = 7.8 Hz, 1H), 5.57 (q, J = 6.9 Hz, 1H), 3.84-3.77 (m, 4H),3.60 (t, J = 5.5 Hz, 2H), 3.38 (s, 3H), 2.71 (s, 3H), 2.69- 2.64 (m,6H), 2.61 (s, 3H), 1.61 (d, J = 7.0 Hz, 3H). LCMS [M + 1] ⁺: 446.2.12-91

¹H NMR (400 MHz, CD₃OD) δ = 9.11 (s, 1H), 7.73 (d, J = 7.8 Hz, 1H), 7.54(dd, J = 7.7, 1.3 Hz, 1H), 7.29 (t, J = 7.8 Hz, 1H), 7.20 (s, 1H), 5.47(q, J = 6.8 Hz, 1H), 4.50 (s, 4H), 4.36 (s, 4H), 2.90 (s, 3H), 2.73 (s,6H), 1.66 (d, J = 7.0 Hz, 3H). LCMS [M + 1] ⁺: 414.1. 12-92

¹H NMR (400 MHz, CD₃OD) δ 8.95 (s, 1H), 7.71-7.62 (m, 1H), 7.57-7.48 (m,1H), 7.26- 7.18 (m, 1H), 7.05 (s, 1H), 5.69 (q, J = 7.0 Hz, 1H), 4.29(s, 4H), 3.54 (s, 4H), 2.61 (s, 3H), 2.39 (s, 3H), 1.69 (d, J = 7.0 Hz,3H). LCMS [M + 1] ⁺: 461.6. 12-93

¹H NMR (400 MHz, CD₃OD) δ = 8.98 (s, 1H), 7.72 (dd, J = 7.9, 1.3 Hz,1H), 7.49 (dd, J = 7.7, 1.3 Hz, 1H), 7.31 (s, 1H), 7.25 (t, J = 7.8 Hz,1H), 5.58 (q, J = 6.9 Hz, 1H), 3.86-3.79 (m, 4H), 3.76 (t, J = 5.9 Hz,2H), 2.72 (s, 3H), 2.71-2.60 (m, 9H), 1.61 (d, J = 7.0 Hz, 3H). LCMS[M + 1] ⁺: 432.2. 12-94

¹H NMR (400 MHz, CD₃OD) δ = 9.12 (s, 1H), 7.74 (dd, J = 8.0, 1.4 Hz,1H), 7.53 (dd, J = 7.7, 1.4 Hz, 1H), 7.44 (s, 1H), 7.28 (t, J = 7.8 Hz,1H), 5.54 (q, J = 6.9 Hz, 1H), 4.01 (d, J = 15.7 Hz, 4H), 3.84 (d, J =24.5 Hz, 4H), 2.73 (s, 3H), 2.70 (s, 3H), 2.11-2.00 (m, 1H), 1.65 (d, J= 6.9 Hz, 3H), 1.00-0.91 (m, 2H), 0.94-0.85 (m, 2H). LCMS [M + 1] ⁺:456.2. 12-95

¹H NMR (400 MHz, CD₃OD) δ = 9.10 (d, J = 0.8 Hz, 1H), 7.71 (dd, J = 8.0,1.4 Hz, 1H), 7.51 (dd, J = 7.6, 1.3 Hz, 1H), 7.42 (s, 1H), 7.26 (t, J =7.8 Hz, 1H), 5.50 (q, J = 7.0 Hz, 1H), 4.01- 3.94 (m, 2H), 3.90-3.81 (m,2H), 3.81-3.69 (m, 4H), 2.71 (s, 3H), 2.68 (s, 3H), 2.18 (s, 3H), 1.63(d, J = 6.9 Hz, 3H). LCMS [M + 1] ⁺: 430.1. 12-96

¹H NMR (400 MHz, CD₃OD) δ = 8.96 (d, J = 0.8 Hz, 1H), 7.73 (dd, J = 8.0,1.3 Hz, 1H), 7.50 (dd, J = 7.5, 1.3 Hz, 1H), 7.25 (t, J = 7.8 Hz, 1H),7.03 (s, 1H), 5.59 (q, J = 6.9 Hz, 1H), 3.94- 3.84 (m, 2H), 3.63-3.51(m, 1H), 3.41-3.34 (m, 1H), 3.06- 2.96 (m, 1H), 2.73 (s, 3H), 2.62 (s,3H), 2.39 (s, 7H), 2.07-1.91 (m, 1H), 1.63 (d, J = 6.9 Hz, 3H). LCMS[M + 1] ⁺: 416.2. 12-97

¹H NMR (400 MHz, DMSO- d₆) δ = 8.97 (s, 1H), 7.70 (t, J = 7.2 Hz, 1H),7.61 (t, J = 12 Hz, 1H), 7.47 (d, J = 6.6 Hz, 1H), 7.30 (t, J = 7.8 Hz,1H), 7.07 (s, 1H), 5.68-5.61 (m, 1H), 3.87-3.79 (m, 1H), 3.79- 3.72 (m,1H), 3.56-3.44 (m, 1H), 3.34-3.25 (m, 1H), 2.95- 2.86 (m, 1H), 2.54 (s,3H), 2.26 (s, 7H), 1.98-1.83 (m, 1H), 1.61 (d, J = 7.0 Hz, 3H). LCMS[M + 1] ⁺: 463.2. 12-98

¹H NMR (400 MHz, CD₃OD) δ = 9.08 (s, 1H), 7.24 (s, 1H), 7.20 (t, J = 7.0Hz, 1H), 7.12-6.99 (m, 2H), 5.70 (q, J = 7.0 Hz, 1H), 3.99 (d, J = 12.7Hz, 2H), 3.84 (d, J = 12.5 Hz, 2H), 3.41- 3.34 (m, 2H), 2.66 (s, 3H),2.08-2.01 (m, 1H), 1.70 (d, J = 7.0 Hz, 3H). LCMS [M + 1] ⁺: 398.0.12-99

¹H NMR (400 MHz, DMSO- d₆) δ = 8.97 (s, 1H), 7.56 (t, J = 7.3 Hz, 1H),7.43 (dt, J = 28.4, 8.1 Hz, 2H), 7.27-7.09 (m, 3H), 5.70-5.58 (m, 1H),5.08 (s, 1H), 4.78 (s, 1H), 3.92- 3.85 (m, 1H), 3.74-3.68 (m, 1H),3.66-3.59 (m, 1H), 3.44- 3.36 (m, 1H), 3.31-3.28 (m, 1H), 2.54 (s, 3H),2.03-1.93 (m, 2H), 1.60 (d, J = 7.0 Hz, 3H). LCMS [M + 1] ⁺: 430.1.12-100

¹H NMR (400 MHz, DMSO- d₆) δ 8.99 (s, 1H), 7.56 (t, J = 7.5 Hz, 2H),7.50-7.08 (m, 4H), 5.70-5.59 (m, 1H), 4.49- 4.34 (m, 2H), 3.86-3.76 (m,2H), 3.63-3.55 (m, 1H), 3.27- 3.22 (m, 1H), 3.11-3.06 (m, 1H), 2.96-2.89(m, 1H), 2.77- 2.69 (m, 1H), 2.64-2.57 (m, 1H), 2.55 (s, 3H), 2.35-2.17(m, 3H), 1.60 (d, J = 7.0 Hz, 3H). LCMS [M + 1] ⁺: 473.3. 12-101

¹H NMR (400 MHz, DMSO- d₆) δ 8.96 (s, 1H), 7.57 (t, J = 7.5 Hz, 1H),7.51-7.41 (m, 2H), 7.28-7.20 (m, 1H), 7.13- 7.07 (m, 1H), 5.73 (s, 1H),5.70-5.59 (m, 1H), 4.06- 3.93 (m, 4H), 2.55 (s, 3H), 1.60 (d, J = 7.0Hz, 3H), 1.50 (s, 3H). LCMS [M + 1] ⁺: 418.0. 12-102

¹H NMR (400 MHz, DMSO- d₆) δ = 9.00 (s, 1H), 7.60-7.10 (m, 5H),5.70-5.60 (m, 1H), 3.74 (t, J = 5.1 Hz, 4H), 2.57- 2.53 (m, 7H), 2.42(q, J = 7.2 Hz, 2H), 1.61 (d, J = 7.0 Hz, 3H), 1.08 (t, J = 7.1 Hz, 3H).LCMS [M + 1] ⁺: 445.7. 12-103

¹H NMR (400 MHz, CD₃OD) δ = 9.18 (s, 1H), 8.33 (s, 1H), 7.50- 7.43 (m,2H), 7.35 (dd, J = 7.9, 2.8 Hz, 1H), 5.46-5.36 (m, 1H), 4.74 (d, J =13.5 Hz, 1H), 4.54 (d, J = 13.0 Hz, 1H), 3.93-3.82 (m, 2H), 3.79-3.68(m, 1H), 3.43-3.33 (m, 1H), 3.31-3.23 (m, 1H), 3.03- 2.95 (m, 1H),2.87-2.77 (m, 2H), 2.75 (s, 3H), 2.70 (s, 3H), 2.47-2.29 (m, 3H), 1.63(d, J = 7.0 Hz, 3H). LCMS [M + 1] ⁺: 462.2. 12-104

¹H NMR (400 MHz, CD₃OD) δ = 9.00 (d, J = 0.8 Hz, 1H), 7.47 (dd, 9.9, 2.8Hz, 1H), 7.34- 7.27 (m, 2H), 5.59-5.49 (m, 1H), 4.28-4.20 (m, 2H), 3.50-3.39 (m, 2H), 2.70 (s, 3H), 2.63 (s, 3H), 2.29 (s, 6H), 1.79- 1.75 (m,4H), 1.61 (d, J = 7.0 Hz, 3H), 1.13 (s, 3H). LCMS [M + 1] ⁺: 462.4.12-105

¹H NMR (400 MHz, CD₃OD) δ 8.98 (s, 1H), 7.46 (dd, J = 10.0, 2.8 Hz, 1H),7.30 (dd, J = 7.9, 2.8 Hz, 1H), 7.07 (s, 1H), 5.58- 5.48 (m, 1H), 5.17(s, 1H), 4.81 (s, 1H), 4.00-3.93 (m, 1H), 3.87 (d, J = 7.4 Hz, 1H),3.72-3.64 (m, 1H), 3.51 (d, J = 10.3 Hz, 1H), 2.70 (s, 3H), 2.64 (s,3H), 2.10-2.05 (m, 2H), 1.61 (d, J = 7.0 Hz, 3H). LCMS [M + 1] ⁺: 419.3.12-106

¹H NMR (400 MHz, CD₃OD) δ = 9.17 (s, 1H), 7.50 (dd, J = 9.9, 2.8 Hz,1H), 7.32 (dd, J = 7.9, 2.8 Hz, 1H), 7.30 (s, 1H), 5.53-5.43 (m, 1H),4.88- 4.82 (m, 2H), 4.03-3.95 (m, 2H), 3.90-3.82 (m, 2H), 3.41- 3.32 (m,1H), 2.74 (s, 3H), 2.69 (s, 3H), 2.02 (d, J = 9.1 Hz, 1H), 1.64 (d, J =7.0 Hz, 3H). LCMS [M + 1] ⁺: 419.2. 12-107

¹H NMR (400 MHz, CD₃OD) δ = 9.02 (s, 1H), 7.47 (dd, J = 9.8, 2.8 Hz,1H), 7.33 (dd, J = 7.9, 2.9 Hz, 1H), 7.06 (s, 1H), 5.47 (q, J = 7.0 Hz,1H), 4.19- 4.06 (m, 4H), 2.69 (s, 3H), 2.68 (s, 3H), 1.63 (s, 3H), 1.61(d, J = 1.7 Hz, 3H). LCMS [M + 1] ⁺: 407.2. 12-108

¹H NMR (400 MHz, CD₃OD) δ 8.95 (s, 1H), 7.47 (dd, J = 9.9, 2.8 Hz, 1H),7.29 (dd, J = 7.9, 2.8 Hz, 1H), 7.02 (s, 1H), 5.58- 5.48 (m, 1H),4.06-3.98 (m, 2H), 3.93-3.84 (m, 2H), 2.68 (s, 3H), 2.64 (s, 3H), 2.27(s, 6H), 1.60 (d, J = 7.0 Hz, 3H), 1.45 (s, 3H). LCMS [M + 1] ⁺: 434.2.12-109

¹H NMR (400 MHz, CD₃OD) δ = 9.00 (s, 1H), 7.43 (dd, J = 9.9, 2.8 Hz,1H), 7.25 (dd, J = 8.8, 2.8 Hz, 1H), 7.10 (s, 1H), 5.69-5.59 (m, 1H),5.18 (s, 1H), 4.82 (s, 1H), 4.01-3.94 (m, 1H), 3.91-3.85 (m, 1H),3.74-3.66 (m, 1H), 3.56- 3.49 (m, 1H), 2.64 (s, 3H), 2.60 (s, 3H),2.11-2.06 (m, 2H), 1.62 (d, J = 6.9 Hz, 3H). LCMS [M + 1] ⁺: 462.0.12-110

¹H NMR (400 MHz, CD₃OD) δ = 8.98 (s, 1H), 7.43 (dd, J = 9.8, 2.8 Hz,1H), 7.26 (dd, J = 8.9, 2.8 Hz, 1H), 7.06 (s, 1H), 5.68-5.60 (m, 1H),4.10- 4.02 (m, 2H), 3.97-3.89 (m, 2H), 2.64 (s, 3H), 2.59 (s, 3H), 2.29(s, 6H), 1.62 (d, J = 7.0 Hz, 3H), 1.47 (s, 3H). LCMS [M + 1] ⁺: 477.0.12-111

¹H NMR (400 MHz, CD₃OD) δ = 8.96 (s, 1H), 7.43 (dd, J = 9.9, 2.8 Hz,1H), 7.26 (dd, J = 8.9, 2.8 Hz, 1H), 7.04 (s, 1H), 5.64 (q, J = 6.9 Hz,1H), 4.14 (dd, J = 8.8, 3.4 Hz, 2H), 4.08 (dd, J = 8.8, 3.7 Hz, 2H),2.63 (s, 3H), 2.60 (s, 3H), 1.65- 1.59 (m, 6H). LCMS [M + 1] ⁺: 450.4.12-112

¹H NMR (400 MHz, CD₃OD) δ = 9.04 (s, 1H), 7.46-7.39 (m, 1H), 7.36 (s,1H), 7.29-7.22 (m, 1H), 5.69-5.61 (m, 1H), 4.68-4.57 (m, 1H), 4.48- 4.40(m, 1H), 3.94-3.85 (m, 2H), 3.81-3.70 (m, 1H), 3.45- 3.35 (m, 1H),3.25-3.15 (m, 1H), 3.02-2.94 (m, 1H), 2.85- 2.78 (m, 1H), 2.77-2.67 (m,1H), 2.65 (s, 3H), 2.60 (s, 3H), 2.48-2.32 (m, 3H), 1.62 (d, J = 6.9 Hz,3H). LCMS [M + 1] ⁺: 505.5. 12-113

¹H NMR (400 MHz, CD₃OD) δ = 9.08 (s, 1H), 7.45 (d, J = 9.9 Hz, H),7.27-7.17 (m, H), 5.70-5.63 (m, 1H), 4.03- 3.96 (m, 3H), 3.88-3.80 (m,2H), 3.39-3.34 (m, 2H), 2.67 (s, 2H), 2.61 (s, 3H), 2.05 (d,J = 8.9 Hz,1H), 1.64 (d, J = 6.9 Hz, 2H). LCMS [M + 1] ⁺: 462.0. 12-114

¹H NMR (400 MHz, CD₃OD) δ = 9.07 (s, 1H), 8.52 (s, 1H), 7.63-7.55 (m,1H), 7.41- 7.32 (m, 1H), 7.15 (s, 1H), 5.60- 5.51 (m, 1H), 5.25-5.20 (m,1H), 4.62-4.58 (m, 1H), 4.02- 3.95 (m, 1H), 3.92-3.85 (m, 1H), 3.75-3.68(m, 1H), 3.61- 3.52 (m, 1H), 2.68 (s, 3H), 2.10 (s, 2H), 1.70 (d, J =7.0 Hz, 3H). LCMS [M + 1] ⁺: 423.2. 12-115

¹H NMR (400 MHz, DMSO- d₆) δ 8.96 (s, 1H), 7.57 (t, J = 7.5 Hz, 1H),7.51-7.36 (m, 2H), 7.28-7.20 (m, 2H), 7.11 (s, 1H), 5.70-5.58 (m, 1H),3.91 (dd, J = 8.2, 4.8 Hz, 2H), 3.81 (dd, J = 8.2, 2.1 Hz, 2H), 2.55 (s,3H), 2.16 (s, 6H), 1.60 (d, J = 7.0 Hz, 3H), 1.33 (s, 3H). LCMS [M + 1]⁺: 445.1. 12-116

¹H NMR (400 MHz, CD₃OD) δ = 8.94 (s, 1H), 7.55 (t, J = 7.5 Hz, 1H), 7.44(t, J = 7.1 Hz, 1H), 7.21-6.85 (m, 3H), 5.68 (q, J = 7.0 Hz, 1H), 4.28(s, 4H), 3.53 (s, 4H), 2.62 (s, 3H), 2.38 (s, 3H), 1.69 (d, J = 7.0 Hz,3H). LCMS [M + 1] ⁺: 443.5. 12-117

¹H NMR (400 MHz, DMSO- d₆) δ = 8.99 (s, 1H), 7.61-7.08 (m, 7H),5.70-5.60 (m, 1H), 3.74 (t, J = 5.0 Hz, 4H), 2.56 (s, 3H), 2.49-2.43 (m,4H), 2.27 (s, 3H), 1.61 (d, J = 7.0 Hz, 3H). LCMS [M + 1] ⁺: 431.2.12-118

¹H NMR (400 MHz, CD₃OD) δ = 9.03 (s, 1H), 7.47-7.40 (m, 1H), 7.35 (s,1H), 7.25 (dd, J = 8.8, 2.8 Hz, 1H), 5.64 (q, J = 6.9 Hz, 1H), 3.90-3.83(m, 4H), 2.70-2.65 (m, 4H), 2.64 (s, 3H), 2.60 (s, 3H), 2.55 (q, J = 7.2Hz, 2H), 1.62 (d, J = 6.9 Hz, 3H), 1.20 (t, J = 7.2 Hz, 3H). LCMS [M +1] ⁺: 477.6. 12-119

¹H NMR (400 MHz, CD₃OD) δ = 9.04 (s, 1H), 7.43 (dd, 9.8, 2.7 Hz, 1H),7.36 (s, 1H), 7.25 (dd, J = 8.9, 2.8 Hz, 1H), 5.64 (q, J = 7.1 Hz, 1H),3.90- 3.83 (m, 4H), 2.67-2.58 (m, 10H), 2.40 (s, 3H), 1.62 (d, J = 6.9Hz, 3H). LCMS [M + 1] ⁺: 463.4. 12-120

¹H NMR (400 MHz, CD₃OD) δ = 9.20 (d, J = 0.8 Hz, 1H), 7.62 (dd, J = 9.3,5.0 Hz, 1H), 7.50 (s, 1H), 7.41 (dd, J = 9.4, 5.7 Hz, 1H), 5.49 (q, J =7.0 Hz, 1H), 4.77-4.72 (m, 2H), 4.57 (d, J = 13.4 Hz, 2H), 3.94- 3.84(m, 2H), 3.75 (td, J = 11.5, 2.4 Hz, 1H), 3.45-3.35 (m, 1H), 3.01 (d, J= 11.5 Hz, 1H), 2.88-2.78 (m, 2H), 2.76 (s, 3H), 2.47-2.38 (m, 1H),2.42- 2.31 (m, 1H), 1.71 (d, J = 7.1 Hz, 3H). LCMS [M + 1] ⁺: 466.3.12-121

¹H NMR (400 MHz, CD₃OD) δ 9.10 (s, 1H), 7.58 (dd, J = 9.2, 5.1 Hz, 1H),7.37 (dd, J = 9.5, 5.7 Hz, 1H), 7.24 (s, 1H), 5.62 (q, J = 7.1 Hz, 1H),4.89 (s, 1H), 4.00 (d, J = 12.8 Hz, 2H), 3.86 (d, J = 12.6 Hz, 2H),3.42- 3.34 (m, 2H), 2.68 (s, 3H), 2.06 (d, J = 9.0 Hz, 1H), 1.71 (d, J =7.0 Hz, 3H). LCMS [M + 1] ⁺: 423.1. 12-122

¹H NMR (400 MHz, CD₃OD) δ = 9.09 (d, J = 0.8 Hz, 1H), 8.45 (s, 1H), 7.60(dd, J = 9.3, 5.1 Hz, 1H), 7.38 (dd, J = 9.5, 5.7 Hz, 1H), 7.12 (s, 1H),5.52 (q, J = 7.0 Hz, 1H), 4.16-4.09 (m, 2H), 4.02-3.95 (m, 2H), 2.71 (s,3H), 2.34 (s, 6H), 1.70 (d, J = 7.0 Hz, 3H), 1.49 (s, 3H). LCMS [M + 1]⁺: 438.2. 12-123

¹H NMR (400 MHz, CD₃OD) δ = 9.07 (s, 1H), 8.51 (s, 1H), 7.59 (dd, J =9.2, 5.1 Hz, 1H), 7.41 (s, 1H), 7.35 (dd, J = 9.5, 5.7 Hz, 1H), 5.55 (q,J = 7.3 Hz, 1H), 4.68-4.59 (m, 5H), 2.75 (s, 6H), 2.66 (s, 3H), 2.11-2.03 (m, 2H), 1.96-1.85 (m, 1H), 1.70 (d, J = 7.1 Hz, 3H), 1.48 (s, 3H).LCMS [M + 1] ⁺: 466.3. 12-124

¹H NMR (400 MHz, CD₃OD) δ = 8.94 (s, 1H), 7.41 (dd, J = 8.6, 5.9 Hz,1H), 7.02 (s, 1H), 6.90-6.77 (m, 2H), 5.56 (q, J = 6.9 Hz, 1H), 4.01 (d,J = 8.4 Hz, 2H), 3.88 (d, J = 8.4 Hz, 2H), 2.63 (s, 3H), 2.47 (s, 3H),2.26 (s, 6H), 1.59 (d, J = 6.9 Hz, 3H), 1.44 (s, 3H). LCMS [M + 1] ⁺:409.4. 12-125

¹H NMR (400 MHz, DMSO- d₆) δ = 15.02 (s, 1H), 12.35 (s, 1H), 9.48 (s,1H), 9.30 (s, 1H), 8.48 (s, 1H), 7.47 (d, J = 7.8 Hz, 1H), 7.22-7.12 (m,1H), 7.00 (t, J = 9.0 Hz, 1H), 5.39- 5.31 (m, 1H), 5.15-5.03 (m, 2H),4.27-4.20 (m, 1H), 4.03- 3.95 (m, 2H), 3.79-3.71 (m, 3H), 3.35-3.06 (m,2H), 3.59- 3.55 (m, 2H), 2.80 (s, 3H), 2.37 (s, 3H), 1.66 (d, J = 7.0Hz, 3H). LCMS [M + 1] ⁺: 473.3. 12-126

¹H NMR (400 MHz, CD₃OD) δ = 9.04 (s, 1H), 7.25 (d, J = 7.8 Hz, 1H), 7.20(s, 1H), 7.13- 7.03 (m, 1H), 6.91-6.82 (m, 1H), 5.62 (q, J = 6.9 Hz,1H), 4.87-4.81 (m, 2H), 3.99- 3.91 (m, 2H), 3.85-3.76 (m, 2H), 3.38-3.32(m, 1H), 2.65 (s, 3H), 2.40-2.35 (m, 3H), 2.02 (d, 1H), 1.61 (d, J = 7.0Hz, 3H). LCMS [M + 1] ⁺: 394.3. 12-127

¹H NMR (400 MHz, CD₃OD) δ = 8.97 (s, 1H), 8.04 (d, J = 8.0 Hz, 1H), 7.79(d, J = 7.6 Hz, 1H), 7.70-7.59 (m, 1H), 7.10 (s, 1H), 5.72 (q, J = 6.4Hz, 1H), 5.16 (br s, 1H), 4.81 (s, 1H), 3.96 (dd, J = 1.2, 7.2 Hz, 1H),3.87 (d, J = 7.2 Hz, 1H), 3.69 (dd, J = 1.2, 10.0 Hz, 1H), 3.52 (br d, J= 10.4 Hz, 1H), 2.59 (s, 3H), 2.07 (s, 2H), 1.67 (d, J = 6.8 Hz, 3H).LCMS [M + 1]⁺: 455.3. 12-128

¹H NMR (400 MHz, CD₃OD) δ = 8.99 (s, 1H), 7.28 (s, 1H), 6.67 (q, J = 2.2Hz, 2H), 6.49 (t, J = 55.6 Hz, 1H), 5.28 (q, J = 6.9 Hz, 1H), 4.56 (d, J= 13.1 Hz, 1H), 4.41 (d, J = 12.7 Hz, 1H), 3.91-3.81 (m, 2H), 3.72 (td,J = 11.5, 2.3 Hz, 1H), 3.36 (t, J = 10.7 Hz, 1H), 3.15 (td, J = 12.6,3.1 Hz, 1H), 2.94 (d, J = 11.5 Hz, 1H), 2.78 (d, J = 11.6 Hz, 1H),2.71-2.64 (m, 1H), 2.63 (s, 3H), 2.46-2.29 (m, 3H), 1.62 (d, J = 7.0 Hz,3H). LCMS [M + 1]⁺: 471.5. 12-129

¹H NMR (400 MHz, CD₃OD) δ = 9.06 (s, 1H), 7.15 (s, 1H), 6.73-6.68 (m,2H), 6.52 (t, J = 55.7 Hz, 1H), 5.33 (q, J = 6.9 Hz, 1H), 4.85 (s, 2H),3.96 (t, J = 11.6 Hz, 2H), 3.82 (dd, J = 12.7, 5.2 Hz, 2H), 3.40-3.33(m, 1H), 2.67 (s, 3H), 2.05 (d, J = 9.0 Hz, 1H), 1.65 (d, J = 7.0 Hz,3H). LCMS [M + 1]⁺: 428.4. 12-130

¹H NMR (400 MHz, CD₃OD) δ = 8.92 (s, 1H), 6.93 (s, 1H), 6.70 (s, 2H),6.52 (t, J = 55.6 Hz, 1H), 5.29 (q, J = 6.9 Hz, 1H), 4.12-4.02 (m, 4H),2.64 (s, 3H), 1.64 (d, J = 7.0 Hz, 3H), 1.60 (s, 3H). LCMS [M + 1]⁺:416.4. 12-131

¹H NMR (400 MHz, DMSO- d₆) δ = 8.97 (s, 1H), 8.31 (s, 1H), 7.41 (s, 1H),7.36 (d, J = 7.2 Hz, 1H), 7.18 (t, J = 7.2 Hz, 1H), 7.09-7.04 (m, 1H),6.95 (t, J = 7.6 Hz, 1H), 5.66-5.62 (m, 1H), 4.44-4.36 (m, 2H),3.89-3.75 (m, 2H), 3.58-3.54 (m, 1H), 3.21-3.20 (m, 1H), 3.11-3.05 (m,1H), 2.91 (d, J = 11.2 Hz, 1H), 2.72 (d, J = 11.6 Hz, 1H), 2.57-2.56 (m,1H), 2.55 (s, 3H), 2.30-2.26 (m, 1H), 2.24 (s, 3H), 2.22- 2.15 (m, 2H),1.56 (d, J = 7.2 Hz, 3H). LCMS [M + 1] ⁺: 437.1. 12-132

¹H NMR (400 MHz, DMSO- d₆) δ 8.95 (s, 1H), 7.33 (d, J = 7.4 Hz, 1H),7.18 (t, J = 7.2 Hz, 1H), 7.13-7.06 (m, 2H), 6.96 (t, J = 7.6 Hz, 1H),5.71 (s, 1H), 5.64 (q, J = 7.0 Hz, 1H), 4.05-3.92 (m, 4H), 2.54 (s, 3H),2.25 (s, 3H), 1.56 (d, J = 7.0 Hz, 3H), 1.49 (s, 3H). LCMS [M + 1] ⁺:382.3. 12-133

¹H NMR (400 MHz, DMSO- d₆) δ 8.94 (s, 1H), 8.28 (s, 0H), 7.32 (d, J =7.3 Hz, 1H), 7.19 (t, J = 7.6 Hz, 1H), 7.10 (d, J = 4.2 Hz, 2H), 6.96(t, J = 7.5 Hz, 1H), 5.62 (q, J = 6.9 Hz, 1H), 3.89 (dd, J = 8.2, 5.2Hz, 2H), 3.79 (dd, J = 8.1, 3.2 Hz, 2H), 2.54 (s, 3H), 2.24 (s, 3H),2.15 (s, 6H), 1.56 (d, J = 7.0 Hz, 3H), 1.32 (s, 3H). LCMS [M + 1] ⁺:409.4. 12-134

¹H NMR (400 MHz, DMSO- d₆) δ 9.04 (s, 1H), 7.45 (d, J = 7.4 Hz, 1H),7.28 (s, 1H), 7.21 (t, J = 7.3 Hz, 1H), 7.09 (t, J = 7.2 Hz, 1H), 6.96(t, J = 7.6 Hz, 1H), 5.67 (t, J = 7.1 Hz, 1H), 4.81 (d, J = 6.4 Hz, 2H),3.95- 3.85 (m, 2H), 3.77-3.67 (m, 2H), 2.57 (s, 3H), 2.25 (s, 3H), 1.95(d, J = 8.8 Hz, 1H), 1.57 (d, J = 7.0 Hz, 3H). LCMS [M + 1] ⁺: 394.0.

Example 13-14-methyl-N—((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(((S)-tetrahydrofuran-3-yl)oxy)phthalazin-1-amine

To a solution of(R)-7-bromo-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine(70.0 mg, 164 μmol, 1.00 eq) in toluene (1.00 mL) was added sodiumhydride (13.2 mg, 329 μmol, 60.0% in mineral oil, 2.00 eq) at 0° C.under a nitrogen atmosphere, then (S)-tetrahydrofuran-3-ol (43.6 mg, 494μmol, 3.00 eq), Pd₂(dba)₃ (15.1 mg, 16.5 μmol, 0.10 eq) and Tol-BINAP(22.4 mg, 33.0 μmol, 0.20 eq) was added the mixture. The reactionmixture was warmed to 100° C. and stirred 1 hour under a nitrogenatmosphere. After this time, the mixture was cooled to 25° C., slowlyquenched with an aqueous saturated ammonium chloride (30.0 mL) thenextracted with ethyl acetate (20.0 mL×3). The combined organic phaseswere washed with brine (30.0 mL), dried over anhydrous sodium sulfate,filtered, and concentrated under vacuum to give a residue. The residuewas purified by prep-HPLC (column: Phenomenex luna C18 80×40 mm×3 μm;mobile phase: phase A: water with 0.04% HCl, phase B: acetonitrile;gradient of B %: 30%-52%) to give4-methyl-N—((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(((S)-tetrahydrofuran-3-yl)oxy)phthalazin-1-amine(6.31 mg, 14.0 μmol, 8.5% yield, HCl salt) as a white solid. LCMS[M+1]⁺: 432.1

¹H NMR (400 MHz, DMSO-d₆) δ=15.31 (s, 1H), 8.91 (s, 1H), 8.90-8.34 (m,2H), 7.82-7.77 (m, 2H), 7.56 (d, J=8.0 Hz, 1H), 7.35 (t, J=8.0 Hz, 1H),5.56 (s, 1H), 5.52-5.47 (m, 1H), 4.05-4.03 (m, 1H), 3.93-3.84 (m, 3H),2.79 (s, 3H), 2.58 (s, 3H), 2.45-2.43 (m, 1H), 2.08-2.06 (m, 1H), 1.63(d, J=7.2 Hz, 3H).

SFC conditions: Chiralcel OD-3 3 μm, 0.46 cm id×5 cm L; Mobile phase:MeOH (0.05% isopropylamine); Gradient: B in A from 10% to 40% in 3minutes; Flow rate: 4.0 mL/min; Column temperature: 35° C.; Wavelength:220 nm

Example 13-2(R)-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(oxetan-3-yloxy)phthalazin-1-amine

A mixture of(R)-7-bromo-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine(100 mg, 236 μmol, 1.00 eq.), oxetan-3-ol (26.2 mg, 354 μmol, 1.50 eq),sodium tert-butoxide (68.0 mg, 707 μmol, 3.00 eq.) and[2-(2-aminophenyl)phenyl]-methylsulfonyloxy-palladium;di-tert-butyl-[2-(2,4,6-triisopropyl phenyl)phenyl]phosphane (18.7 mg,23.6 μmol, 0.10 eq.) in dioxane (2.00 mL) was degassed and purged withnitrogen 3 times, then the mixture was stirred at 100° C. for 1 hr undera nitrogen atmosphere. The mixture was filtered and concentrated undervacuum to give a residue. The residue was purified by prep-TLC (SiO₂,dichloromethane/methanol=20/1), then purified by prep-HPLC (column:Phenomenex luna C18 150×25 mm×10 um; mobile phases: phase A:water(0.225% TFA), phase B: acetonitrile; phase B gradient: 17%-47%) togive(R)-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(oxetan-3-yloxy)phthalazin-1-amine(5.20 mg, 12.4 μmol, 5.25% yield, 99.4% purity) as an off-white solid.LCMS [M+1]⁺: 418.0.

¹H NMR (400 MHz, CD₃OD) δ=8.19 (d, J=8.8 Hz, 1H), 7.78-7.73 (m, 1H),7.71 (d, J=8.0 Hz, 1H), 7.61-7.56 (m, 1H), 7.52 (d, J=7.6 Hz, 1H), 7.26(t, J=8.0 Hz, 1H), 5.69-5.59 (m, 2H), 5.21-5.12 (m, 2H), 4.81-4.75 (m,2H), 2.75 (s, 3H), 2.63 (s, 3H), 1.67 (d, J=7.2 Hz, 3H).

Following the teachings of the General Reaction Scheme III, and theprocedure described for the preparation of Examples 13-1 and 13-2, thefollowing compound of Formula (I), Example 13-3 shown in Table 13 wasprepared.

TABLE 13 Ex. # Structure Spectral Data 13-3

¹H NMR (400 MHz, CD₃OD) = 8.04 (d, J = 9.2 Hz, 1H), 7.81 (d, J = 2.4 Hz,1H), 7.73 (d, J = 7.6 Hz, 1H), 7.54-7.48 (m, 2H), 7.25 (t, J = 8.0 Hz,1H), 5.66-5.55 (m, 1H), 5.38-5.33 (m, 1H), 4.12-4.05 (m, 1H), 4.04-3.99(m, 2H), 3.98-3.91 (m, 1H), 2.75 (s, 3H), 2.67 (s, 3H), 2.46-2.35 (m,1H), 2.25- 2.17 (m, 1H), 1.63 (d, J = 7.2 Hz, 3H). LCMS [M + 1] ⁺:2-methyl-3-((R)-1-(4-methyl-7-(((S)- 389.1.tetrahydrofuran-3-yl)oxy)phthalazin-1- yl)amino)ethyl)benzonitrile

Example 14-1

Step A: To a solution of 6 6-bromo-4-chloro-1-methylphthalazine (500 mg,1.94 mmol, 1.00 eq.) in chloroform (8.00 mL) were added NBS (380 mg,2.14 mmol, 1.10 eq.) and AIBN (48.0 mg, 0.29 mmol, 0.15 eq.), and thereaction mixture was stirred at 90° C. for 3 hours. The reaction mixturewas then cooled to 25° C., quenched with water (20.0 mL) and extractedwith ethyl acetate (30.0 mL×3). The combined organic layers were washedwith brine (25.0 mL×2), dried over sodium sulfate, filtered, andconcentrated under reduced pressure to give a residue. The residue waspurified by column chromatography (SiO₂, petroleum ether/ethylacetate=10/1 to 1/1) to give 6-bromo-1-(bromomethyl)-4-chlorophthalazine(180 mg, 535 μmol, 27.6% yield) as a yellow solid. LCMS [M+3]⁺: 336.6.

¹H NMR (400 MHz, DMSO-d₆) δ=8.52-8.50 (m, 1H), 8.41 (dd, J=1.2, 3.6 Hz,2H), 5.42 (s, 1H), 5.31 (s, 1H).

Step B: To a solution of dimethylamine (48.2 mg, 1.07 mmol, 0.05 mL,2.00 eq., HCl salt) in tetrahydrofuran (10.0 mL) was added/V, A^(f)-diisopropyl ethyl amine (207 mg, 1.61 mmol, 0.28 mL, 3.00 eq.), then6-bromo-1-(bromomethyl)-4-chlorophthalazine (180 mg, 0.54 mmol, 1.00eq.) was added to the reaction mixture and the mixture was stirred at25° C. for 12 hours. The mixture was diluted with water (30.0 mL) andextracted with ethyl acetate (30.0 mL×3). The combined organic layerswere washed with brine (30.0 mL×2), dried over sodium sulfate, filtered,and concentrated under reduced pressure to give a residue. The residuewas purified by prep-TLC (SiO₂, petroleum ether/ethyl acetate=1/1,Rf=0.4) to give1-(6-bromo-4-chlorophthalazin-1-yl)-N,N-dimethylmethanamine (80.0 mg,266 μmol, 49.7% yield) as a yellow solid. LCMS [M+3]⁺: 301.9

¹H NMR (400 MHz, DMSO-dis) 8=8.51 (d, J=8.8 Hz, 1H), 8.44 (d, J=1.6 Hz,1H), 8.30 (dd, J=2.0, 8.8 Hz, 1H), 4.02 (s, 2H), 2.22 (s, 6H).

Step C: To a solution of1-(6-bromo-4-chlorophthalazin-1-yl)-A/A-dimethylmethanamine (120 mg,0.40 mmol, 1.00 eq.) and(R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethan-1-amine (89.2 mg, 0.44mmol, 1.10 eq.) in dimethylsulfoxide (3.00 mL) was added potassiumfluoride (69.6 mg, 1.20 mmol, 0.03 mL, 3.00 eq.), then the reaction wasstirred at 130° C. for 2 hours. The reaction was cooled to 25° C.,quenched with water (20.0 mL) and extracted with ethyl acetate (20.0mL×3). The combined organic layers were washed with brine (20.0 mL×2),dried over sodium sulfate, filtered, and concentrated under reducedpressure to give a residue. The residue was purified by prep-TLC (SiO₂,petroleum ether/ethyl acetate=1/1, Rf=0.2) to give(R)-7-bromo-4-((dimethylamino)methyl)-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine(90.0 mg, 192 μmol, 48.2% yield) as a yellow oil. LCMS [M+1]⁺: 467.0.

Step D: To a solution of(R)-7-bromo-4-((dimethylamino)methyl)-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine(60.0 mg, 0.13 mmol, 1.00 eq.), morpholine (28.0 mg, 0.32 mmol, 0.03 mL,2.50 eq.), cesium carbonate (125 mg, 0.39 mmol, 3.00 eq.) and RuPhos(12.0 mg, 0.03 mmol, 0.20 eq.) in dioxane (8.00 mL) was added Pd₂(dba)₃(11.8 mg, 0.02 mmol, 0.10 eq.), then degassed and purged with nitrogen 3times, and the reaction mixture was stirred at 100° C. for 2 hours undera nitrogen atmosphere. The reaction was cooled to 25° C., diluted withwater (20.0 mL) and extracted with ethyl acetate (30.0 mL×3). Thecombined organic layers were washed with brine (25.0 mL×2), dried oversodium sulfate, filtered, and concentrated under reduced pressure togive a residue. The residue was purified by prep-TLC (SiO₂, petroleumether/ethyl acetate=1/1) to give(R)-4-((dimethylamino)methyl)-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-morpholinophthalazin-1-amine(5.75 mg, 12.1 μmol, 9.45% yield, 99.9% purity) as a yellow solid. LCMS[M+1]⁺: 474.3.

¹H NMR (400 MHz, DMSO-d₆) δ=8.09 (d, J=8.8 Hz, 1H), 7.76 (d, J=8.0 Hz,1H), 7.62 (s, 1H), 7.58 (dd, J=2.0, 8.8 Hz, 1H), 7.52 (br d, J=12 Hz,2H), 7.32 (t, J=7.6 Hz, 1H), 5.77-5.67 (m, 1H), 3.86-3.80 (m, 4H),3.45-3.40 (m, 4H), 3.31 (br s, 2H), 2.58 (s, 3H), 2.16 (br s, 6H), 1.56(d, J=12 Hz, 3H).

SFC conditions: Chiralcel OD-3 50×4.6 mm I.D., 3 um Mobile phase: PhaseA for CO₂, and Phase B for MeOH (0.05% DEA), Gradient elution: MeOH(0.05% DEA) in CO₂ from 5% to 40% Flow rate: 3 mL/min, Detector: PDA,Column Temp: 35° C., Back Pressure: 100 Bar.

Example 14-2

Step A: To a mixture of 6-bromo-1-(bromomethyl)-4-chlorophthalazine (150mg, 446 μmol, 1.00 eq.) in dimethylformamide (15.0 mL) was addedpotassium phthalimide (116 mg, 624 μmol, 1.40 eq.) at 25° C. under anitrogen atmosphere. The mixture was stirred at 85° C. for 2 hours thencooled to 25° C. Then the mixture was diluted with water (50.0 mL) andextracted with ethyl acetate (50.0 mL×3). The combined organic phaseswere washed with brine (100 mL), dried over anhydrous sodium sulfate,filtered, and concentrated under vacuum to give a residue. The residuewas purified by column chromatography (SiO₂, petroleum ether/ethylacetate=5/1) to give2-((6-bromo-4-chlorophthalazin-1-yl)methyl)isoindoline-1,3-dione (150mg, 373 μmol, 83.6% yield) as a yellow solid. LCMS [M+1]⁺: 404.0.

¹H NMR (400 MHz, DMSO-d₆) δ=8.55 (m, 2H), 8.40 (m, 1H), 7.95 (m, 2H),7.90 (m, 2H), 5.60 (s, 2H).

Step B: A solution of2-((6-bromo-4-chlorophthalazin-1-yl)methyl)isoindoline-1,3-dione (130mg, 323 μmol, 1.00 eq.) and(R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethan-1-amine (65.6 mg, 323μmol, 1.00 eq.) in dimethyl sulfoxide (7.00 mL) was addedNN-diisopropylethylamine (125 mg, 969 μmol, 169 μL, 3.00 eq.) andpotassium fluoride (56.3 mg, 969 μmol, 22.7 μL, 3.00 eq.) was stirred at130° C. for 12 hours in a sealed tube. The reaction was cooled to 25° C.and diluted with water (50.0 mL) and extracted with ethyl acetate (50.0mL×3). The combined organic phases were washed with brine (100 mL),dried over sodium sulfate, filtered, and concentrated under reducedpressure to give a residue. The residue was purified by columnchromatography (SiO₂, petroleum ether/ethyl acetate=5/1) to give(R)-2-((6-bromo-4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-1-yl)methyl)isoindoline-1,3-dione(130 mg, 228 μmol, 70.7% yield) as a yellow solid. LCMS [M+1]⁺: 472.2.

¹H NMR (400 MHz, DMSO-d₆) δ=8.91 (s, 1H), 8.20-8.07 (m, 2H), 7.97-7.80(m, 5H), 7.74 (d, J=8.0 Hz, 1H), 7.51 (d, J=8.0 Hz, 1H), 7.31 (t, J=8.0Hz, 1H), 5.72-5.60 (m, 1H), 5.25 (s, 2H), 2.44 (s, 3H), 1.50 (d, J=12Hz, 3H).

Step C: To a solution of(R)-2-((6-bromo-4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-1-yl)methyl)isoindoline-1,3-dione(100 mg, 176 μmol, 1.00 eq.) and morpholine (61.2 mg, 703 μmol, 61.8 μL,4.00 eq.) in methylbenzene (10.0 mL) was added BINAP (21.9 mg, 35.1μmol, 0.20 eq), cesium carbonate (172 mg, 527 μmol, 3.00 eq.) andPd₂(dba)₃ (16.1 mg, 17.6 μmol, 0.10 eq.) at 25° C. under a nitrogenatmosphere. The mixture was stirred at 100° C. for 1 hour. The reactionwas completed and cooled to 25° C. The reaction mixture was quenchedwith water (50.0 mL) and extracted with ethyl acetate (50.0 mL×3). Thecombined organic phases were washed with brine (100 mL), dried oversodium sulfate, filtered, and concentrated under reduced pressure togive a residue. The residue was purified by column chromatography (SiO₂,petroleum ether/ethyl acetate=1/1) to give(R)-2-((4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)-6-morpholinophthalazin-1-yl)methyl)isoindoline-1,3-dione(65.0 mg, 113 μmol, 64.3% yield) as a yellow solid. LCMS [M+1]⁺: 576.3.

¹H NMR (400 MHz, DMSO-d₆) δ=8.03 (br d, J=10.0 Hz, 1H), 7.94-7.85 (m,4H), 7.74 (br d, J=7.2 Hz, 1H), 7.65 (br s, 2H), 7.51 (br d, J=8.0 Hz,1H), 7.43 (br d, J=7.2 Hz, 1H), 7.31 (br t, J=6.8 Hz, 1H), 5.72-5.67 (m,1H), 5.18 (s, 2H), 3.83 (m, 4H), 3.45 (m, 4H), 2.44 (s, 3H), 1.51 (d,J=7.2 Hz, 3H).

Step D: To a solution of(R)-2-((4-((1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)amino)-6-morpholinophthalazin-1-yl)methyl)isoindoline-1,3-dione(60.0 mg, 104 μmol, 1.00 eq.) in ethanol (6.00 mL) was added hydrazinehydrate (47.0 mg, 938 μmol, 45.6 μL, 9.00 eq.) at 25° C. under anitrogen atmosphere. The mixture was stirred at 25° C. for 1 hour, thenquenched with water (10.0 mL) and extracted with ethyl acetate (10.0mL×3). The combined organic layers were washed with brine (30.0 mL),dried over sodium sulfate, filtered, and concentrated under reducedpressure to give a residue. The crude product was purified byreverse-phase HPLC (water (0.04% HCl)/CH₃CN) to give(R)-4-(aminomethyl)-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-morpholinophthalazin-1-amine(5.81 mg, 13.0 μmol, 12.5% yield, hydrochloride salt) as a yellow solid.LCMS [M+1]⁺: 446.1.

¹H NMR (400 MHz, DMSO-d₆) δ=8.62 (br s, 3H), 8.12 (br s, 2H), 7.79 (brd, J=7.6 Hz, 2H), 7.61 (br d, J=8.0 Hz, 1H), 7.38 (br t, J=8.0 Hz, 1H),5.66 (br d, J=6.4 Hz, 1H), 4.56 (br s, 2H), 3.81 (br t, J=4.8 Hz, 4H),3.62 (br s, 4H), 2.53 (m, 3H), 1.70 (br d, J=5.6 Hz, 3H).

Example 14-33-((R)-1-((7-((1R,4R)-2-oxa-5-azabicyclo[2.2.1]heptan-5-yl)-4-((methylamino)methyl)pyrido[3,4-d]pyridazin-1-yl)amino)ethyl)-2-methylbenzonitrile

Step A: To a solution of(R)-3-(1-((7-chloro-4-methylpyrido[3,4-d]pyridazin-1-yl)amino)ethyl)-2-methylbenzonitrile(30.0 mg, 88.8 μmol, 1.00 eq.) in dioxane (1.00 mL) was added seleniumdioxide (19.7 mg, 178 μmol, 19.3 μL, 2.00 eq.), and the mixture wasstirred at 100° C. for 1 hour. The mixture was then concentrated underreduced pressure, and the residue was purified by column chromatography(SiO₂, petroleum ether/ethyl acetate=20/1 to 5/1) to give(R)-3-(1-((7-chloro-4-formylpyrido[3,4-b]pyridazin-1-yl)amino)ethyl)-2-methylbenzonitrile(16.0 mg, 45.5 μmol, 51.2% yield) as a yellow solid.

¹H NMR (400 MHz, DMSO-dis) 5=10.06 (s, 1H), 9.99 (s, 1H), 9.09 (br d,J=6.8 Hz, 1H), 8.76 (s, 1H), 7.78 (br d, J=8.0 Hz, 1H), 7.66 (br d,J=7.6 Hz, 1H), 7.36 (br t, J=8.0 Hz, 1H), 5.81 (br d, J=6.4 Hz, 1H),2.69 (s, 3H), 1.63 (br d, J=6.8 Hz, 3H).

Step B: To a solution of(R)-3-(1-((7-chloro-4-formylpyrido[3,4-d]pyridazin-1-yl)amino)ethyl)-2-methylbenzonitrile(106 mg, 301 μmol, 1.00 eq.) and methylamine tetrahydrofuran solution(2.0 M, 360 μL, 2.39 eq.) in THF (3.00 mL) was added acetic acid (1.81mg, 30.1 μmol, 1.72 μL, 0.10 eq.), and the mixture was stirred at 50° C.for 30 minutes. After this time was added sodium triacetoxyborohydride(192 mg, 904 μmol, 3.00 eq.), and shorly after the mixture was pouredinto water (5.00 mL). The aqueous phase was extracted with ethyl acetate(10.0 mL×3), and the combined organic phases were washed with brine(10.0 mL×2), dried over anhydrous sodium sulfate, filtered, andconcentrated under reduced pressure to give(R)-3-(1-((7-chloro-4-((methylamino)methyl)pyrido[3,4-d]pyridazin-1-yl)amino)ethyl)-2-methylbenzonitrile(65.0 mg, 177 μmol, 58.8% yield) as a yellow solid. LCMS [M+1]⁺: 367.2.

Step C: To a solution of(R)-3-(1-((7-chloro-4-((methylamino)methyl)pyrido[3,4-d]pyridazin-1-yl)amino)ethyl)-2-methylbenzonitrile(34.0 mg, 92.7 μmol, 1.00 eq.) and (Boc)₂O (22.3 mg, 102 μmol, 23.4 μL,1.10 eq.) in DCM (0.50 mL) was added DMAP (1.13 mg, 9.27 μmol, 0.10eq.), and the mixture was stirred at 25° C. for 1 hour. The mixture wasthen concentrated under reduced pressure, and the residue was purifiedby prep-TLC (SiO₂, petroleum ether/ethyl acetate=2:1) to give tert-butyl(R)-((7-chloro-1-((1-(3-cyano-2-methylphenyl)ethyl)amino)pyrido[3,4-b]pyridazin-4-yl)methyl)(methyl)carbamate(35.0 mg, 75.0 μmol, 80.9% yield) as a yellow solid.

¹H NMR (400 MHz, CD₃OD) δ=9.43 (br s, 1H), 8.50 (s, 1H), 7.72 (d, J=7.2Hz, 1H), 7.52 (dd, J=1.2, 7.6 Hz, 1H), 7.29-7.24 (m, 1H), 5.68-5.62 (m,1H), 2.78-2.75 (m, 5H), 1.63 (d, J=7.2 Hz, 3H), 1.49-1.41 (m, 9H), 1.22(s, 3H).

Step D: To a solution of tert-butyl(R)-((7-chloro-1-((1-(3-cyano-2-methylphenyl)ethyl)amino)pyrido[3,4-b]pyridazin-4-yl)methyl)(methyl)carbamate(30.0 mg, 64.3 μmol, 1.00 eq.) and((1R,4R)-2-oxa-5-azabicyclo[2.2.1]heptane (7.01 mg, 51.7 μmol, 0.8 eq.,HCl) in DMSO (0.10 mL) was added cesium fluoride (19.5 mg, 128 μmol,4.74 μL, 2.00 eq.) and N,N-diisopropylethylamine (16.6 mg, 128 μmol,22.4 μL, 2.00 eq.), and the mixture was stirred at 130° C. for 1 hour.The solution was then cooled to 25° C., poured into water (10.0 mL), andthe aqueous phase was extracted with ethyl acetate (10.0 mL×3). Thecombined organic phases were washed with brine (10.0 mL×3), dried overanhydrous sodium sulfate, filtered, and concentrated under reducedpressure to give tert-butyl((7-((1R,4R)-2-oxa-5-azabicyclo[2.2.1]heptan-5-yl)-1-(((R)-1-(3-cyano-2-methylphenyl)ethyl)amino)pyrido[3,4-d]pyridazin-4-yl)methyl)(methyl)carbamate(30.0 mg, crude) as a yellow solid. LCMS [M+1]⁺: 530.2.

Step E: To a solution of tert-butyl((7-((1R,4R)-2-oxa-5-azabicyclo[2.2.1]heptan-5-yl)-1-(((R)-1-(3-cyano-2-methylphenyl)ethyl)amino)pyrido[3,4-b]pyridazin-4-yl)methyl)(methyl)carbamate(18.0 mg, 34.0 μmol, 1.00 eq.) in acetonitrile (1.50 mL) was addedhydrochloric acid/dioxane (0.50 mL), and the mixture was stirred at 0°C. for 30 minutes. The mixture was then poured into water (5.00 mL), andthe aqueous phase was extracted with ethyl acetate (5.00 mL×3). Thecombined organic phases were washed with brine (5.00 mL×3), dried overanhydrous sodium sulfate, filtered, and concentrated under reducedpressure. The residue was purified by prep-HPLC [column: 3_PhenomenexLuna C18 75×30 mm×3 um; mobile phase: phase A: water (0.05% HCl), phaseB: acetonitrile; B %: 7%-27%] to give3-((R)-1-((7-((1R,4R)-2-oxa-5-azabicyclo[2.2.1]heptan-5-yl)-4-((methylamino)methyl)pyrido[3,4-d]pyridazin-1-yl)amino)ethyl)-2-methylbenzonitrile(7.00 mg, 14.9 μmol, 43.8% yield, 99.1% purity, hydrochloride salt) as ayellow solid. LCMS [M+1]⁺: 430.3.

¹H NMR (400 MHz, CD₃OD) δ=9.09 (s, 1H), 7.83 (br d, J=7.6 Hz, 1H), 7.71(d, J=7.6 Hz, 1H), 7.63-7.40 (m, 2H), 5.56 (q, J=6.4 Hz, 1H), 5.41 (brs, 1H), 4.83 (s, 3H), 3.96 (d, J=6.8 Hz, 1H), 3.84 (br s, 1H), 3.69 (brd, J=9.6 Hz, 1H), 3.49 (br d, J=3.2 Hz, 1H), 2.93 (s, 3H), 2.64 (s, 3H),2.09 (br s, 2H), 1.84 (d, J=6.8 Hz, 3H).

Example 14-43-((R)-1-((7-((1R,4R)-2-oxa-5-azabicyclo[2.2.1]heptan-5-yl)-4-((dimethylamino)methyl)pyrido[3,4-b]pyridazin-1-yl)amino)ethyl)-2-methylbenzonitrile

To a solution of3-((R)-1-((7-((1R,4R)-2-oxa-5-azabicyclo[2.2.1]heptan-5-yl)-4-((methylamino)methyl)pyrido[3,4-b]pyridazin-1-yl)amino)ethyl)-2-methylbenzonitrile(12.0 mg, 27.9 μmol, 1.00 eq.) and paraformaldehyde (1.68 mg) inmethanol (1.00 mL) was added acetic acid (168 ug, 2.79 μmol, 0.16 μL,0.10 eq.) and sodium cyanoborohydride (3.51 mg, 55.9 μmol, 2.00 eq.),and the mixture was stirred at 25° C. for 1 hour. The mixture was thenpoured into water (5.00 mL), and the aqueous phase was extracted withethyl acetate (5.00 mL×3). The combined organic phases were washed withbrine (5.00 mL×3), dried over anhydrous sodium, filtered, andconcentrated under reduced pressure. The residue was purified byprep-HPLC [column: 3_Phenomenex Luna C18 75×30 mm×3 um; mobile phase:phase A: water (0.05% HCl), phase B: acetonitrile; B %: 9%-29%] to give3-((R)-1-((7-((1R,4R)-2-oxa-5-azabicyclo[2.2.1]heptan-5-yl)-4-((dimethylamino)methyl)pyrido[3,4-d]pyridazin-1-yl)amino)ethyl)-2-methylbenzonitrile(5.20 mg, 11.4 μmol, 40.8% yield, 97.2% purity, hydrochloride salt) as ayellow solid. LCMS [M+1]⁺: 444.3.

¹H NMR (400 MHz, CD₃OD) δ=9.11 (s, 1H), 7.83 (br d, J=7.6 Hz, 1H), 7.71(d, J=7.6 Hz, 1H), 7.58-7.29 (m, 2H), 5.56 (q, J=6.4 Hz, 1H), 5.42 (brs, 1H), 5.04-4.93 (m, 2H), 4.83-4.81 (m, 1H), 3.95 (br d, J=7.6 Hz, 1H),3.82 (br s, 1H), 3.67 (br s, 1H), 3.48 (br s, 1H), 3.11 (s, 6H), 2.64(s, 3H), 2.08 (br s, 2H), 1.84 (br d, J=6.8 Hz, 3H).

Following the teachings of the General Reaction Scheme III, and theprocedure described for the preparation of Examples 14-3-14-4, thefollowing compounds of Formula (I), Examples 14-5 to 14-6 shown in Table14 were prepared.

TABLE 14 Ex. # Structure Spectral Data 14-5

¹H NMR (400 MHz, CD₃OD) δ = 8.94 (s, 1H), 8.53 (s, 1H), 7.67 (d, J = 7.6Hz, 1H), 7.51 (d, J = 7.6 Hz, 1H), 7.25 (t, J = 8.0 Hz, 1H), 7.16 (s,1H), 5.77- 5.65 (m, 1H), 5.17 (br s, 1H), 4.81 (s, 1H), 4.57-4.43 (m,2H), 3.99-3.92 (m, 1H), 3.85 (d, J = 7.6 Hz, 1H), 3.74-3.63 (m, 1H),3.50 (br d, J = 10.4 Hz, 1H), 2.74 (s, 3H), 2.59 (s, 3H), 2.07 (s, 2H),1.65 (d, J = 6.8 Hz, 3H). LCMS [M + 1] ⁺: 473.3.7-((1R,4R)-2-oxa-5-azabicyclo[2.2.1]heptan-5- yl)-N-((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-4-((methylamino)methyl)pyrido[3,4-d]pyridazin- 1-amine Formate salt 14-6

¹H NMR (400 MHz, CD₃OD) δ = 9.15 (s, 1H), 7.68 (d, J = 8.0 Hz, 1H), 7.50(d, J = 7.6 Hz, 1H), 7.32-7.19 (m, 1H), 7.12 (s, 1H), 5.77-5.63 (m, 1H),5.17 (br s, 1H), 4.80 (s, 1H), 4.07-4.01 (m, 1H), 3.99-3.93 (m, 2H),3.85 (d, J = 7.2 Hz, 1H), 3.71-3.64 (m, 1H), 3.50 (br d, J = 10.4 Hz,1H), 2.60 (s, 3H), 2.42 (s, 6H), 2.06 (s, 2H), 1.63 (d, J = 7.2 Hz, 3H).LCMS [M + 1] ⁺: 487.2.7-((1R,4R)-2-oxa-5-azabicyclo[2.2.1]heptan-5-yl)-4-((dimethylamino)methyl)-N-((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)pyrido[3,4- d]pyridazin-1-amine

Example 15-1N—((R)-1-(3-amino-5-(trifluoromethyl)phenyl)ethyl)-4-methyl-7-(((S)-tetrahydrofuran-3-yl)oxy)phthalazin-1-amine

Step A: To a solution of 6-bromo-4-chloro-1-methylphthalazine (605 mg,2.35 mmol, 1.10 eq.) in DMSO (1.50 mL) was added potassium fluoride (372mg, 6.41 mmol, 150 μL, 3.00 eq.) and(R)-1-(3-nitro-5-(trifluoromethyl)phenyl)ethan-1-amine (commerciallyavailable, 500 mg, 2.14 mmol, 1.00 eq.). The mixture was stirred at 130°C. for 2 hours. The reaction mixture was quenched by addition water(3.00 mL) at 20° C., and then diluted with ethyl acetate (5.00 mL) andextracted with ethyl acetate (5.00 mL×3). The combined organic layerswere washed with brine (5.00 mL×3), dried over sodium sulfate, filtered,and concentrated under reduced pressure to give a residue. The residuewas purified by prep-TLC (SiO₂, petroleum ether:ethyl acetate, 1:1) togive(R)-7-bromo-4-methyl-N-(1-(3-nitro-5-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine(260 mg, 571 μmol, 26.8% yield) as a yellow oil. LCMS [M+1]⁺: 455.0.

Step B: To a solution of(R)-7-bromo-4-methyl-N-(1-(3-nitro-5-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine(20.0 mg, 43.9 μmol, 1.00 eq.) in dioxane (0.50 mL) and water (0.30 mL)was added potassium hydroxide (4.93 mg, 87.9 μmol, 2.00 eq.) andt-BuXPhos Pd G3 (3.49 mg, 4.39 μmol, 0.10 eq.), The mixture was stirredat 80° C. for 2 hours. The mixture was diluted with water (3.00 mL) andextracted with ethyl acetate (3.00 mL×2). The combined organic layerswere washed with brine (3.00 mL×3), dried over sodium sulfate, filtered,and concentrated under reduced pressure to give a crude product(R)-1-methyl-4-((1-(3-nitro-5-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6-ol(16.0 mg, 40.8 umol) as a brown oil used into the next step withoutfurther purification. LCMS [M+1]⁺: 393.1.

Step C: To a solution of(R)-1-methyl-4-((1-(3-nitro-5-(trifluoromethyl)phenyl)ethyl)amino)phthalazin-6-ol(16.0 mg, 40.8 μmol, 1.00 eq.) in DMF (1.50 mL) was added cesiumcarbonate (39.9 mg, 122 μmol, 3.00 eq.) and (R)-tetrahydrofuran-3-yl4-methylbenzenesulfonate (14.8 mg, 61.2 μmol, 1.50 eq.), The mixture wasstirred at 80° C. for 12 hours. The residue was diluted with water (2.00mL) and extracted with ethyl acetate (3.00 mL×3). The combined organiclayers were washed with brine (5.00 mL×2), dried over sodium sulfate,filtered, and concentrated under reduced pressure to give a residue. Thecrude product4-methyl-N—((R)-1-(3-nitro-5-(trifluoromethyl)phenyl)ethyl)-7-(((R)-tetrahydrofuran-3-yl)oxy)phthalazin-1-amine(18.0 mg, 38.93 μmol, crude) as a brown oil used into the next stepwithout further purification. LCMS [M+1]⁺: 463.1.

Step D: To a solution of7-methyl-N—((R)-1-(3-nitro-5-(trifluoromethyl)phenyl)ethyl)-7-(((R)-tetrahydrofuran-3-yl)oxy)phthalazin-1-amine(18.0 mg, 38.9 μmol, 1.00 eq.) in ethanol (1.00 mL) and water (0.20 mL)was added iron powder (10.9 mg, 195 μmol, 5.00 eq.) and ammoniumchloride (10.4 mg, 195 μmol, 5.00 eq). The mixture was stirred at 80° C.for 2 hours. The residue was diluted with methanol (3.00 mL), filtered,and concentrated under reduced pressure to give a residue. The residuewas purified by prep-HPLC [Phenomenex Gemini-NX C18 75×30 mm×3 um;mobile phase: phase A: water(10 mM NH₃HCO₃), phase B: MeCN; B %:25%-55%] to giveN—((R)-1-(3-amino-5-(trifluoromethyl)phenyl)ethyl)-4-methyl-7-(((S)-tetrahydrofuran-3-yl)oxy)phthalazin-1-amine(7.00 mg, 16.2 μmol, 41.6% yield) as a off-white solid. LCMS [M+1]⁺:433.2.

¹H NMR (400 MHz, CD₃OD) δ=8.00 (d, J=8.8 Hz, 1H), 7.77 (d, J=2.4 Hz,1H), 7.49 (dd, J=2.4, 9.2 Hz, 1H), 6.98 (br d, J=2.4 Hz, 2H), 6.76 (s,1H), 5.42 (q, J=6.8 Hz, 1H), 5.34 (br dd, J=4.4, 6.0 Hz, 1H), 4.13-3.90(m, 4H), 2.67 (s, 3H), 2.46-2.32 (m, 1H), 2.26-2.15 (m, 1H), 1.64 (d,J=7.2 Hz, 3H).

Example 15-2

Step A: A solution of(R)-1-(2-methyl-5-nitro-3-(trifluoromethyl)phenyl)ethan-1-amine (250 mg,1.01 mmol, 1.00 eq.) and 6-bromo-4-chloro-1-methylphthalazine (259 mg,1.01 mmol, 1.00 eq.) in dimethyl sulfoxide (3.00 mL),N,N-diisopropylethylamine (390 mg, 3.02 mmol, 526 μL, 3.00 eq.) andpotassium fluoride (175 mg, 3.02 mmol, 70.7 μL, 3.00 eq.) was stirredunder a nitrogen atmosphere at 130° C. for 12 hours in a sealed tube.The reaction was cooled to 25° C. and the reaction was quenched withwater (50.0 mL) and then extracted with ethyl acetate (30.0 mL×3). Thecombined organic phases were washed with brine (20.0 mL), dried overanhydrous sodium sulfate, filtered, and concentrated under reducedpressure to give a residue. The residue was purified by prep-TLC (SiO₂,petroleum ether/ethyl acetate=0/1) to give(R)-7-bromo-4-methyl-N-(1-(2-methyl-5-nitro-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine(200 mg, 426 μmol, 42.3% yield) as a yellow solid. LCMS [M+1]⁺: 469.0.

¹H NMR (400 MHz, DMSO-d₆) δ=8.81 (s, 1H), 8.80 (s, 1H), 8.25 (s, 1H),8.07-8.04 (m, 1H), 7.96-7.92 (m, 2H), 5.68-5.64 (m, 1H), 2.74 (s, 3H),2.60 (s, 3H), 1.58 (d, J=6.8 Hz, 3H).

Step B: To a solution of morpholine (44.5 mg, 511 μmol, 45.0 μL, 3.00eq.),(R)-7-bromo-4-methyl-N-(1-(2-methyl-5-nitro-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine(80.0 mg, 170 μmol, 1.00 eq) and cesium carbonate (166 mg, 511 μmol,3.00 eq) in dioxane (2.00 mL) was added RuPhos (15.9 mg, 34.1 μmol, 0.20eq) and Pd₂(dba)₃ (15.6 mg, 17.0 μmol, 0.10 eq) under a nitrogenatmosphere. The mixture was stirred at 110° C. for 1 hour, then cooledto 25° C., quenched with water (40.0 mL), and then extracted with ethylacetate (20.0 mL×3). The combined organic phases were washed with brine(40.0 mL), dried over anhydrous sodium sulfate, filtered, andconcentrated under reduced pressure to give a residue. The residue waspurified by prep-TLC (SiO₂, dichloromethane:methanol=10/1) to give(R)-4-methyl-N-(1-(2-methyl-5-nitro-3-(trifluoromethyl)phenyl)ethyl)-7-morpholinophthalazin-1-amine(50.0 mg, 105 μmol, 61.6% yield) as a yellow solid.

¹H NMR (400 MHz, DMSO-d₆) δ=8.57 (d, J=2.4 Hz, 1H), 8.24 (d, J=2.4 Hz,1H), 7.82 (d, J=8.8 Hz, 1H), 7.62-7.58 (m, 2H), 5.67-5.64 (m, 1H),3.85-3.82 (m, 4H), 3.44-3.43 (m, 4H), 2.74 (s, 3H), 2.51 (s, 3H), 1.59(d, J=7.2 Hz, 3H).

Step C: To a solution of(R)-4-methyl-N-(1-(2-methyl-5-nitro-3-(trifluoromethyl)phenyl)ethyl)-7-morpholinophthalazin-1-amine(45.0 mg, 94.6 μmol, 1.00 eq) and ammonium chloride (50.6 mg, 946 μmol,10.0 eq) in ethanol (1.20 mL) and water (0.40 mL) was added iron powder(52.8 mg, 946.4 μmol, 10.0 eq) at 90° C. under a nitrogen atmosphere.The reaction mixture was stirred at 90° C. for 1 hour, then cooled to25° C. The mixture was filtered and concentrated under reduced pressureto give a residue which was purified by prep-HPLC [column: Phenomenexluna C18 80×40 mm×3 um; mobile phase: phase A: water (0.04% HCl), phaseB: acetonitrile; B %: 12%-38%] to give(R)—N-(1-(5-amino-2-methyl-3-(trifluoromethyl)phenyl)ethyl)-4-methyl-7-morpholinophthalazin-1-amine(20.0 mg, 44.8 μmol, 47.3% yield, hydrochloride salt) as a white solid.LCMS [M+1]⁺: 446.1.

¹H NMR (400 MHz, DMSO-d₆) δ=14.85 (s, 1H), 8.62 (s, 1H), 8.16 (d, J=9.2Hz, 1H), 7.93 (s, 1H), 7.77-7.74 (m, 1H), 7.23-7.22 (m, 1H), 7.08 (s,1H), 5.37-5.34 (m, 1H), 3.83-3.81 (m, 4H), 3.70-3.68 (m, 4H), 2.73 (s,3H), 2.43 (s, 3H), 1.59 (d, J=6.8 Hz, 3H).

SFC conditions: Chiralcel OD-3 3 μm, 0.46 cm id×5 cm L; Mobile phase: Afor SFC CO₂ and B for MeOH (0.05% isopropylamine); Gradient: B in A from10% to 40% in 3 minutes; Flowrate: 4.0 mL/min; Column temperature: 35°C.; Wavelength: 220 nm; System Back Pressure: 100 bar.

Following the teachings of the General Reaction Scheme VI, and theprocedures described for the preparation of Examples 15-1-15-2, thefollowing compound of Formula (I), Example 15-3 shown in Table 15 wasprepared.

TABLE 15 Ex. # Structure Spectral Data 15-3

¹H NMR (400 MHz, CD₃OD) δ = 8.37-8.35 (m, 1H), 8.26 (d, J = 2.4 Hz, 1H),7.79 (s, 1H), 7.75-7.72 (m, 1H), 7.47-7.46 (m, 1H), 5.58-5.54 (m, 2H),4.15-4.12 (m, 1H), 4.05-4.03 (m, 2H), 3.99-3.96 (m, 1H), 2.85 (s, 3H),2.66 (s, 3H), 2.52- 2.48 (m, 1H), 2.25-2.25 (m, 1H), 1.73 (d, J = 7.2Hz, 3H). LCMS [M + 1]⁺: 447.1. N-((R)-1-(5-amino-2-methyl-3-(trifluoromethyl)phenyl)ethyl)-4-methyl-7-(((S)-tetrahydrofuran-3-yl)oxy)phthalazin-1-amine Hydrochloride salt

Example 16-1(R)—N-(1-(4-amino-6-(trifluoromethyl)pyridin-2-yl)ethyl)-4-methyl-7-morpholinophthalazin-1-amine

Step A: To a solution of(R)-2-(1-aminoethyl)-6-(trifluoromethyl)pyridin-4-amine (6.00 g, 24.8mmol, 1.00 eq., hydrochloride), 6-bromo-4-chloro-1-methylphthalazine(7.03 g, 27.3 mmol, 1.10 eq.) and N,N-diisopropylethylamine (12.8 g,99.3 mmol, 17.3 mL, 4.00 eq.) in DMSO (1.00 mL) was added cesiumfluoride (5.66 g, 37.3 mmol, 1.37 mL, 1.50 eq.) and the mixture wasstirred at 130° C. for 2 hour under a nitrogen atmosphere. The mixturewas then cooled to 25° C., diluted with ethyl acetate (300 mL), washedwith brine (200 mL×2), dried over anhydrous sodium sulfate, filtered,and concentrated under reduced pressure to give a residue, the residuewas purified by silica gel chromatography (petroleum ether/ethylacetate=10/l to dichloromethane/methanol=10/1) to give(R)—N-(1-(4-amino-6-(trifluoromethyl)pyridin-2-yl)ethyl)-7-bromo-4-methylphthalazin-1-amine(9.00 g, 21.1 mmol, 85.0% yield) as a brown solid.

¹H NMR (400 MHz, CDCl₃) δ=8.11 (d, J=2.0 Hz, 1H), 7.89 (dd, J=1.6, 8.8Hz, 1H), 7.78 (d, J=8.8 Hz, 1H), 6.94 (d, J=1.6 Hz, 1H), 6.87 (br s,1H), 6.80 (d, J=2.0 Hz, 1H), 5.58-5.49 (m, 1H), 4.89 (br s, 2H), 2.77(s, 3H), 1.68 (d, J=6.4 Hz, 3H).

Step B: To a solution of(R)—N-(1-(4-amino-6-(trifluoromethyl)pyridin-2-yl)ethyl)-7-bromo-4-methylphthalazin-1-amine(10.0 g, 23.5 mmol, 1.00 eq.) and DMAP (287 mg, 2.35 mmol, 0.10 eq.) inTHF (100 mL) was added di-tert-butyl dicarbonate (10.5 g, 48.1 mmol,11.1 mL, 2.05 eq.), the reaction mixture was stirred at 40° C. for 30minutes, then concentrated under reduced pressure to give a residue. Theresidue was purified by silica gel chromatography (petroleum ether/ethylacetate=10/l to 1/1) to give tert-butyl(R)-(2-(1-((7-bromo-4-methylphthalazin-1-yl)amino)ethyl)-6-(trifluoromethyl)pyridin-4-yl)(tert-butoxycarbonyl)carbamate(7.45 g, 11.9 mmol, 50.7% yield) as a brown solid. LCMS [M+3]⁺: 628.0.

Step C: To a solution of morpholine (4.09 g, 46.9 mmol, 4.13 mL, 4.00eq.) and tert-butyl(R)-(2-(1-((7-bromo-4-methylphthalazin-1-yl)amino)ethyl)-6-(trifluoromethyl)pyridin-4-yl)(tert-butoxycarbonyl)carbamate(7.35 g, 11.7 mmol, 1.00 eq.) in dioxane (100 mL) was added Pd₂(dba)₃(1.07 g, 1.17 mmol, 0.10 eq.), RuPhos (1.09 g, 2.35 mmol, 0.20 eq.) andcesium carbonate (11.5 g, 35.2 mmol, 3.00 eq.) under nitrogen, and thereaction mixture was stirred at 105° C. for 1 hour. The reaction mixturewas cooled to 25° C., filtered, and the filter cake was washed withmethanol (200 mL). The filtrate was concentrated under reduced pressureto give a residue which was purified by silica gel chromatography(petroleum ether/ethyl acetate=10/1 to DCM/methanol=10/1) to givetert-butyl(R)-(2-(1-((4-methyl-7-morpholinophthalazin-1-yl)amino)ethyl)-6-(trifluoromethyl)pyridin-4-yl)carbamate(4.75 g, 8.92 mmol, 76.0% yield) as a brown solid. LCMS [M+1]⁺: 433.3.

Step D: To a solution of tert-butyl(R)-(2-(1-((4-methyl-7-morpholinophthalazin-1-yl)amino)ethyl)-6-(trifluoromethyl)pyridin-4-yl)carbamate(4.75 g, 8.92 mmol, 1.00 eq.) in acetonitrile (20.0 mL) was addedHCl/dioxane (20.0 mL) at 0° C., the reaction was stirred at 0-25° C. for3 hours. After this point, the pH of the mixture was adjusted to pH=7 byportionwise addition of solid sodium bicarbonate. The resulting mixturewas concentrated under reduced pressure to give a residue, which wastriturated with water (200 mL) then filtered. The filter cake was washedwith water (30.0 mL×3), collected, and further triturated withacetonitrile (100 mL). The resulting suspension was filtered, and thefilter cake was collected and dried under vacuum to give the product(R)—N-(1-(4-amino-6-(trifluoromethyl)pyridin-2-yl)ethyl)-4-methyl-7-morpholinophthalazin-1-amine(3.64 g, 7.99 mmol, 89.6% yield, 94.9% purity) as a off-white solid.LCMS [M+1]⁺: 433.1.

¹H NMR (400 MHz, DMSO-d₆) δ=7.84 (d, J=9.2 Hz, 1H), 7.64 (d, J=2.0 Hz,1H), 7.59 (dd, J=2.0, 8.8 Hz, 1H), 7.28 (d, J=6.8 Hz, 1H), 6.73 (d,J=2.0 Hz, 1H), 6.65 (d, J=1.6 Hz, 1H), 6.40 (s, 2H), 5.32-5.23 (m, 1H),3.82 (t, J=4.8 Hz, 4H), 3.44-3.39 (m, 4H), 2.56 (s, 3H), 1.57 (d, J=7.2Hz, 3H).

Example 16-2

Step A: To a solution of 1,7-dichloro-4-methylpyrido[3,4-d]pyridazine(4.87 g, 22.8 mmol, 1.10 eq) and(R)-2-(1-aminoethyl)-6-(trifluoromethyl)pyridin-4-amine (5.00 g, 20.7mmol, 1.00 eq., hydrochloride salt) in DMSO (40.0 mL) was added cesiumfluoride (9.43 g, 62.1 mmol, 2.29 mL, 3.00 eq.) andN,N-diisopropylethylamine (8.02 g, 62.1 mmol, 10.8 mL, 3.00 eq.), andthe mixture was stirred at 130° C. for 2 hours. After this time, themixture was poured into water (50.0 mL), and extracted with ethylacetate (150 mL×3). The combined organic phase were washed with brine(150 mL×3), dried over anhydrous sodium sulfate, filtered, andconcentrated under reduced pressure. The residue was washed withpetroleum ether:ethyl acetate=1:1 to give(R)—N-(1-(4-amino-6-(trifluoromethyl)pyridin-2-yl)ethyl)-7-chloro-4-methylpyrido[3,4-d]pyridazin-1-amine(5.00 g, 13.1 mmol, 63.1% yield) as a gray solid. LCMS [M+1]⁺: 383.2.

Step B: To a solution of(R)—N-(1-(4-amino-6-(trifluoromethyl)pyridin-2-yl)ethyl)-7-chloro-4-methylpyrido[3,4-d]pyridazin-1-amine(115 mg, 300 μmol, 1.00 eq) and (1R,4R)-2-oxa-5-azabicyclo[2.2.1]heptane(61.1 mg, 451 μmol, 1.50 eq., hydrochloride salt) in DMSO (0.20 mL) wasadded N,N-diisopropylethylamine (77.7 mg, 601 μmol, 105 μL, 2.00 eq.)and cesium fluoride (274 mg, 1.80 mmol, 66.5 μL, 6.00 eq), and themixture was stirred at 130° C. for 2 hours. The mixture was diluted withwater (10.0 mL) and extracted with ethyl acetate (10.0 mL×3), and thecombined organic layers were washed with brine (20.0 mL×3), dried oversodium sulfate, filtered, and concentrated under reduced pressure. Theresidue was purified by prep-HPLC [column: 3_Phenomenex Luna C18 75×30mm×3 μm; mobile phase: phase A: water (0.05% HCl), phase B:acetonitrile; B %: 14%-34%] to giveN—((R)-1-(4-amino-6-(trifluoromethyl)pyridin-2-yl)ethyl)-7-((1R,4R)-2-oxa-5-azabicyclo[2.2.1]heptan-5-yl)-4-methylpyrido[3,4-d]pyridazin-1-amine(93.9 mg, 211 μmol, 70.2% yield) as a yellow solid. LCMS [M+1]⁺: 446.2.

¹H NMR (400 MHz, DMSO-d₆) δ=15.19-14.58 (m, 1H), 9.29 (s, 1H), 8.92-8.62(m, 1H), 8.12-7.37 (m, 1H), 6.83 (d, J=2.0 Hz, 1H), 6.71 (br s, 1H),5.41-5.18 (m, 1H), 5.15-5.03 (m, 1H), 4.94-4.76 (m, 1H), 4.02-3.81 (m,2H), 3.80-3.65 (m, 3H), 2.05 (br d, J=4.8 Hz, 2H), 1.65 (br d, J=6.4 Hz,3H).

¹H NMR (400 MHz, CD₃OD) δ=9.29 (s, 1H), 7.80-7.22 (m, 1H), 7.12 (d,J=2.0 Hz, 1H), 7.05 (br s, 1H), 5.53 (br s, 1H), 5.21 (q, J=6.4 Hz, 1H),5.17-4.97 (m, 1H), 4.11-3.83 (m, 2H), 3.82-3.55 (m, 2H), 2.85 (s, 3H),2.24-2.05 (m, 2H), 1.80 (br d, J=6.8 Hz, 3H).

Following the teachings of the General Reaction Scheme III, and theprocedure described for the preparation of Examples 16-1-16-2, thefollowing compounds of Formula (I), Examples 16-3-16-14 shown in Table16 were prepared.

TABLE 16 Ex. # Structure Spectral Data 16-3

¹H NMR (400 MHz, CD₃OD) δ 9.03 (s, 1H), 7.27 (s, 1H), 6.79- 6.72 (m,2H), 5.29 (q, J = 6.8 Hz, 1H), 3.86-3.79 (m, 4H), 3.75-3.70 (m, 4H),1.63 (d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 434.2.(R)-N-(1-(4-amino-6-(trifluoromethyl)pyridin-2-yl)ethyl)-4-methyl-7-morpholinopyrido[3,4- d]pyridazin-1-amine 16-4

¹H NMR (400 MHz, CD₃OD) δ = 7.97 (d, J = 9.2 Hz, 1H), 7.48 (dd, J = 2.4,9.2 Hz, 1H), 7.30 (d, J = 2.4 Hz, 1H), 6.78 (q, J = 2.0 Hz, 2H), 5.34(q, J = 6.8 Hz, 1H), 4.90-4.87 (m, 2H), 3.87-3.78 (m, 2H), 3.76-3.68 (m,2H), 3.35 (s, 1H), 2.65 (s, 3H), 2.06 (d, J = 9.2 Hz, 1H), 1.64 (d, J =6.8 Hz, 3H). LCMS [M + 1] ⁺: 445.2.N-((R)-1-(4-amino-6-(trifluoromethyl)pyridin-2-yl)ethyl)-7-(6-oxa-3-azabicyclo[3.1.1]heptan-3-yl)-4-methylphthalazin-1-amine 16-5

¹H NMR (400 MHz, CD₃OD) δ = 8.30 (d, J = 9.2 Hz, 1H), 7.87 (br s, 1H),7.66 (br d, J = 9.2 Hz, 1H), 7.25 (br s, 1H), 7.17 (s, 1H), 5.46-5.18(m, 1H), 4.98-4.94 (m, 1H), 4.45-4.19 (m, 1H), 4.16-3.83 (m, 3H),3.56-3.36 (m, 1H), 3.11 (s, 3H), 2.85 (s, 3H), 2.62-2.38 (m, 1H),2.36-2.04 (m, 3H), 1.87 (br d, J = 7.2 Hz, 3H). LCMS [M + 1] ⁺: 472.2.N-((R)-1-(4-amino-6-(trifluoromethyl)pyridin-2-yl)ethyl)-4-methyl-7-((1R, 4R)-5-methyl-2,5-diazabicyclo[2.2.2]octan-2-yl)phthalazin-1-amine Hydrochloride salt 16-6

¹H NMR (400 MHz, CD₃OD) δ = 9.37 (s, 1H), 8.18-7.44 (m, 1H), 7.31-7.23(m, 1H), 7.19 (d, J = 2.0 Hz, 1H), 5.69-5.39 (m, 1H), 5.29 (br dd, J =5.2, 6.8 Hz, 1H), 4.36 (br d, J = 13.6 Hz, 1H), 4.06 (br d, J = 11.6 Hz,3H), 3.53-3.36 (m, 1H), 3.11 (s, 3H), 2.89 (s, 3H), 2.61-2.38 (m, 1H),2.06-2.30 (m, 3H), 1.87 (br dd, J = 2.4, 6.8 Hz, 3H). LCMS [M + 1] ⁺:473.2. N-((R)-1-(4-amino-6-(trifluoromethyl)pyridin-2-yl)ethyl)-4-methyl-7-((1R, 4R)-5-methyl-2,5-diazabicyclo[2.2.2]octan-2-yl)pyrido[3,4- d]pyridazin-1-amineHydrochloride salt 16-7

¹H NMR (400 MHz, CD₃OD) δ = 9.22 (s, 1H), 7.34 (s, 1H), 7.09 (d, J = 2.0Hz, 1H), 7.04 (br s, 1H), 5.20 (q, J = 7.2 Hz, 1H), 4.48 (dd, J = 3.6,9.6 Hz, 2H), 4.30 (br t, J = 9.6 Hz, 2H), 3.49 (t, J = 6.8 Hz, 2H), 2.93(s, 3H), 2.83 (s, 3H), 2.55 (t, J = 6.8 Hz, 2H), 1.78 (d, J = 6.8 Hz,3H). LCMS [M + 1]⁺: 487.2.(R)-2-(1-((1-(4-amino-6-(trifluoromethyl)pyridin-2-yl)ethyl)amino)-4-methylpyrido[3,4-d]pyridazin-7-yl)-6-methyl-2,6-diazaspiro[3.4]octan-5-one Hydrochloride salt 16-8

¹H NMR (400 MHz, DMSO- d₆) δ 8.26 (s, 1H), 8.13 (d, J = 9.2 Hz, 1H),7.62 (s, 1H), 7.45 (d, J = 9.1 Hz, 1H), 6.82 (s, 1H), 6.75 (s, 1H),5.18-5.14 (m, 2H), 4.82 (s, 1H), 3.92 (d, J = 7.5 Hz, 1H), 3.75 (d, J =7.6 Hz, 1H), 3.69 (d, J = 10.6 Hz, 1H), 3.46-3.39 (m, 1H), 2.75 (s, 3H),2.04 (s, 2H), 1.67 (d, J = 7.0 Hz, 3H). LCMS [M + 1]⁺: 445.2.N-((R)-1-(4-amino-6-(trifluoromethyl)pyridin-2- yl)ethyl)-7-((1R,4R)-2-oxa-5- azabicyclo[2.2.1]heptan-5-yl)-4-methylphthalazin-1- amineHydrochloride salt 16-9

¹H NMR (400 MHz, CD₃OD) δ = 8.26 (d, J = 9.1 Hz, 1H), 7.64 (d, J = 2.2Hz, 1H), 7.33 (dd, J = 9.0, 2.2 Hz, 1H), 7.08 (q, J = 2.3 Hz, 2H), 5.25(q, J = 7.0 Hz, 1H), 4.60 (dd, J = 14.5, 9.9 Hz, 2H), 4.34 (t, J = 10.2Hz, 2H), 2.96 (s, 6H), 2.83 (s, 3H), 1.85 (s, 3H), 1.81 (d, J = 7.1 Hz,3H). LCMS [M + 1]⁺: 460.2.(R)-N-(1-(4-amino-6-(trifluoromethyl)pyridin-2-yl)ethyl)-7-(3-(dimethylamino)-3-methylazetidin-1-yl)-4-methylphthalazin-1-amine Hydrochloride salt 16-10

¹H NMR (400 MHz, CD₃OD) δ 7.98 (d, J = 8.9 Hz, 1H), 7.15- 7.07 (m, 2H),6.83-6.74 (m, 2H), 5.25 (q, J = 6.9 Hz, 1H), 4.60 (s, 1H), 4.11 (dd, J =8.5, 3.2 Hz, 2H), 4.02 (d, J = 8.5 Hz, 2H), 2.69 (s, 3H), 1.66 (d, J =7.0 Hz, 3H), 1.63 (s, 3H). LCMS [M + 1]⁺: 433.2.(R)-1-(4-((1-(4-amino-6-(trifluoromethyl)pyridin-2-yl)ethyl)amino)-1-methylphthalazin-6-yl)-3- methylazetidin-3-ol 16-11

¹H NMR (400 MHz, DMSO- d₆) δ = 15.06 (s, 1H), 12.63 (s, 1H), 9.31 (s,1H), 9.01 (s, 1H), 7.78 (s, 1H), 6.90 (s, 1H), 6.81 (s, 1H), 6.76 (s,1H), 5.17-5.09 (m, 1H), 4.65 (dd, J = 10.2, 6.0 Hz, 2H), 4.25 (s, 2H),4.17 (d, J = 10.7 Hz, 2H), 2.81 (s, 3H), 2.71 (s, 6H), 1.70 (s, 3H),1.66 (d, J = 7.0 Hz, 2H). LCMS [M + 1]⁺: 461.2.(R)-N-(1-(4-amino-6-(trifluoromethyl)pyridin-2-yl)ethyl)-7-(3-(dimethylamino)-3-methylazetidin-1-yl)-4-methylpyrido[3,4-d]pyridazin-1-amine dihydrochloride salt 16-12

¹H NMR (400 MHz, CD₃OD) δ = 9.02 (s, 1H), 7.29 (s, 1H), 6.79-6.71 (m,2H), 5.29 (q, J = 6.9 Hz, 1H), 3.87-3.80 (m, 4H), 2.64 (s, 3H),2.63-2.58 (m, 4H), 2.38 (s, 3H), 1.62 (d, J = 7.0 Hz, 3H). LCMS [M +1]⁺: 447.3. (R)-N-(1-(4-amino-6-(trifluoromethyl)pyridin-2-yl)ethyl)-4-methyl-7-(4-methylpiperazin-1-yl)pyrido[3,4-d]pyridazin-1-amine 16-13

¹H NMR (400 MHz, CD₃OD) δ = 9.08 (s, 1H), 7.16 (s, 1H), 6.82-6.75 (m,2H), 5.34 (q, J = 7.0 Hz, 1H), 3.98 (d, J = 13.1 Hz, 2H), 3.83 (d, J =12.6 Hz, 2H), 3.41-3.35 (m, 2H), 2.68 (s, 3H), 2.05 (d, J = 9.0 Hz, 1H),1.66 (d, J = 7.0 Hz, 3H). LCMS [M + 1]⁺: 446.2.N-((R)-1-(4-amino-6-(trifluoromethyl)pyridin-2-yl)ethyl)-7-(6-oxa-3-azabicyclo[3.1.1]heptan-3-yl)-4-methylpyrido[3,4-d]pyridazin-1-amine 16-14

¹H NMR (400 MHz, DMSO- d₆) δ = 7.77 (d, J = 9.6 Hz, 1H), 7.26-7.24 (m,2H), 7.08-7.06 (m, 2H), 6.85 (d, J = 6.0 Hz, 1H), 5.52 (s, 2H),5.37-5.33 (m, 1H), 4.90 (s, 1H), 4.74 (s, 1H), 3.86 (d, J = 7.6 Hz, 1H),3.71-3.60 (m, 2H), 3.22 (d, J = 9.6 Hz, 1H), 2.53 (s, 3H), 2.02-1.93 (m,2H), 1.54 (d, J = 6.8 Hz, 3H). LCMS [M + 1]⁺: 462.4.N-((R)-1-(3-amino-4-fluoro-5-(trifluoromethyl)phenyl)ethyl)-7-((1R,4R)-2-oxa-5-azabicyclo[2.2.1]heptan-5-yl)-4-methylphthalazin-1- amine

Example 17-1(R)-2-methoxy-3-(1-((4-methyl-7-morpholinopyrido[3,4-d]pyridazin-1-yl)amino)ethyl)benzonitrile

Step A: To a solution of 1-(3-bromo-2-methoxyphenyl)ethan-1-one (1.00 g,4.37 mmol, 1.00 eq.) and (<S)-2-methylpropane-2-sulfinamide (688 mg,5.68 mmol, 1.30 eq.) in THF (15.0 mL) was added titanium (IV) butoxide(1.99 g, 8.73 mmol, 1.81 mL, 2.00 eq.) and 1,2-dimethoxyethane (393 mg,4.37 mmol, 454 μL, 1.00 eq.), and the mixture was stirred at 70° C. for12 hours. The mixture was then diluted with ethyl acetate (50.0 mL) andwater (5.00 mL), and filtered. The filtrate was concentrated underreduced pressure, and the residue was purified by column chromatography(SiO₂, petroleum ether/ethyl acetate=20/1 to 10/1) to give(S,E)-N-(1-(3-bromo-2-methoxyphenyl)ethylidene)-2-methylpropane-2-sulfinamide(1.25 g, 3.76 mmol, 86.2% yield) as yellow oil.

Step B: To a solution of(S,E)-N-(1-(3-bromo-2-methoxyphenyl)ethylidene)-2-methylpropane-2-sulfinamide(1.25 g, 3.76 mmol, 1.00 eq.) in THF (15.0 mL) was added L-selectride(1.0 M in THF, 5.64 mL, 1.50 eq.) dropwise at −60° C. After the additionwas completed the mixture was warmed to 30° C. and stirred for 30minutes, then diluted with water (5.00 mL) and extracted with ethylacetate (30.0 mL×2). The combined organic phases were concentrated underreduced pressure, and the residue was purified by column chromatography(SiO₂, petroleum ether/ethyl acetate=5/1 to 3/1) to give(S)—N—((R)-1-(3-bromo-2-methoxyphenyl)ethyl)-2-methylpropane-2-sulfinamide(900 mg, 2.69 mmol, 71.6% yield) as yellow oil.

¹H NMR (400 MHz, CDCl₃) δ=7.52-7.44 (m, 1H), 7.34-7.29 (m, 1H), 7.01 (t,J=7.6 Hz, 1H), 5.05-4.95 (m, 1H), 3.92 (s, 3H), 1.50 (d, J=6.8 Hz, 3H),1.21 (s, 9H).

Step C: To a solution of(S)—N—((R)-1-(3-bromo-2-methoxyphenyl)ethyl)-2-methylpropane-2-sulfinamide(900 mg, 2.69 mmol, 1.00 eq.) in THF (12.0 mL) and H₂O (3.00 mL) wasadded iodine (205 mg, 808 μmol, 163 μL, 0.30 eq.), and the mixture wasstirred at 50° C. for 1 hour. The mixture was then diluted with ethylacetate (30.0 mL), washed with sodium sulfite aqueous solution (20.0mL), and further washed with brine (20.0 mL). The organic phase wasdried and concentrated under reduced pressure, then purified by columnchromatography (SiO₂, dichloromethane/methanol=1/0 to 40/1) to give(R)-1-(3-bromo-2-methoxyphenyl)ethan-1-amine (500 mg, 2.17 mmol, 80.7%yield) as yellow oil.

Step D: To a solution of 1,7-dichloro-4-methylpyrido[3,4-d]pyridazine(300 mg, 1.40 mmol, 1.00 eq.) in DMSO (5.00 mL) was added cesiumfluoride (319 mg, 2.10 mmol, 77.5 μL, 1.50 eq.) and(R)-1-(3-bromo-2-methoxyphenyl)ethan-1-amine (322 mg, 1.40 mmol, 1.00eq.), and the mixture was stirred at 130° C. for 30 minutes. The mixturewas then diluted with ethyl acetate (50.0 mL) and washed with brine(30.0 mL×3). The separated organic phases were dried and concentratedunder reduced pressure, and the residue was purified by columnchromatography (SiO₂, petroleum ether/ethyl acetate=5/1 to 4/1) to give(R)—N-(1-(3-bromo-2-methoxyphenyl)ethyl)-7-chloro-4-methylpyrido[3,4-d]pyridazin-1-amine(250 mg, 613 μmol, 43.8% yield) as a yellow solid.

Step E: To a solution of(R)—N-(1-(3-bromo-2-methoxyphenyl)ethyl)-7-chloro-4-methylpyrido[3,4-d]pyridazin-1-amine(200 mg, 491 μmol, 1.00 eq.) in DMSO (0.80 mL) was added cesium fluoride(112 mg, 736 μmol, 27.1 μL, 1.50 eq.) and morpholine (192 mg, 2.21 mmol,194 μL, 4.50 eq.). The mixture was stirred at 130° C. for 30 minutes,then diluted with water (20.0 mL) and filtered. The precipitate wasdried in vacuum to give(R)—N-(1-(3-bromo-2-methoxyphenyl)ethyl)-4-methyl-7-morpholinopyrido[3,4-d]pyridazin-1-amine(200 mg, 436 μmol, 89.0% yield) as a yellow solid. LCMS [M+1]⁺: 460.1.

Step F: A mixture of(R)—N-(1-(3-bromo-2-methoxyphenyl)ethyl)-4-methyl-7-morpholinopyrido[3,4-d]pyridazin-1-amine(180 mg, 393 μmol, 1.00 eq.), zinc cyanide (92.2 mg, 785 μmol, 49.9 μL,2.00 eq.), DPPF (43.5 mg, 78.5 μmol, 0.20 eq.), zinc dust (2.57 mg, 39.3μmol, 0.10 eq.) and Pd₂(dba)₃ (36.0 mg, 39.3 μmol, 0.10 eq.) inN,N-dimethylacetamide (4.00 mL) was degassed and purged with nitrogen (3times), and the mixture was stirred at 120° C. for 6 hours under anitrogen atmosphere. The reaction mixture was diluted with ethyl acetate(100 mL) and filtered. The filtrate was washed with brine (50.0 mL×3),dried, and concentrated under reduced pressure. The residue was purifiedby prep-HPLC [column: Phenomenex luna C18 150×25 mm×10 μm; mobile phase:phase A: water (0.225% formic acid), phase B: acetonitrile; B %:11%-41%] to give(R)-2-methoxy-3-(1-((4-methyl-7-morpholinopyrido[3,4-d]pyridazin-1-yl)amino)ethyl)benzonitrile(93.0 mg, 226 μmol, 57.5% yield, 98.2% purity) as a yellow solid. LCMS[M+1]⁺: 405.2.

¹H NMR (400 MHz, CD₃OD) δ=9.11 (s, 1H), 8.49 (s, 1H), 7.70-7.64 (m, 1H),7.54-7.49 (m, 1H), 7.43 (s, 1H), 7.15 (t, J=7.6 Hz, 1H), 5.66-5.55 (m,1H), 4.20 (s, 3H), 3.85 (s, 8H), 2.69 (s, 3H), 1.62 (d, J=6.8 Hz, 3H).

Example 17-2

3-((R)-1-((7-((R)-hexahydropyrazino[2,1-c][1,4]oxazin-8(1H)-yl)-4-methylpyrido[3,4-d]pyridazin-1-yl)amino)ethyl)-2-methoxybenzonitrile

Step A: To a solution of (R)-1-(3-bromo-2-methoxyphenyl)ethan-1-amine(1.20 g, 5.22 mmol, 1.00 eq.) in THF (20.0 mL) was added Boc₂O (1.48 g,6.78 mmol, 1.56 mL, 1.30 eq.), the mixture was stirred at 25° C. for 2hours. The reaction mixture was concentrated under reduced pressure togive a residue. The residue was purified by column chromatography (SiO₂,petroleum ether/ethyl acetate=200/1 to 30/1) to give tert-butyl(R)-(1-(3-bromo-2-methoxyphenyl)ethyl)carbamate (1.50 g, 4.54 mmol,87.1% yield) as light yellow oil.

¹H NMR (400 MHz, CDCl₃) δ=7.45 (dd, J=1.6, 8.0 Hz, 1H), 7.22 (d, J=6.8Hz, 1H), 6.98 (t, J=7.6 Hz, 1H), 5.10-4.90 (m, 2H), 3.95 (s, 3H),1.46-1.35 (m, 12H).

Step B: A mixture of tert-butyl(R)-(1-(3-bromo-2-methoxyphenyl)ethyl)carbamate (1.30 g, 3.94 mmol, 1.00eq.), zinc cyanide (925 mg, 7.87 mmol, 500 μL, 2.00 eq.), zinc dust(25.7 mg, 394 μmol, 0.10 eq.), DPPF (437 mg, 787 μmol, 0.20 eq.) andPd₂(dba)₃ (361 mg, 394 μmol, 0.10 eq.) in N, N-dimethylacetamide (15.0mL) was degassed and purged with nitrogen (3 times), and the mixture wasstirred at 130° C. for 5 hours under a nitrogen atmosphere. The mixturewas then diluted with ethyl acetate (100 mL), filtered, and the filtratewas washed with brine (50.0 mL×3), dried and concentrated under reducedpressure. The residue was purified by column chromatography (SiO₂,petroleum ether/ethyl acetate=50/1 to 20/1) to give tert-butyl(R)-(1-(3-cyano-2-methoxyphenyl)ethyl)carbamate (0.90 g, 3.26 mmol,82.7% yield) as yellow oil.

¹H NMR (400 MHz, CDCl₃) δ=7.50 (d, J=8.0 Hz, 2H), 7.14 (t, J=7.6 Hz,1H), 5.09-4.91 (m, 2H), 4.15 (s, 3H), 1.54-1.32 (m, 12H).

Step C: To a solution of tert-butyl(R)-(1-(3-cyano-2-methoxyphenyl)ethyl)carbamate (0.90 g, 3.26 mmol, 1.00eq.) in DCM (2.00 mL) was added TFA (6.93 g, 60.8 mmol, 4.50 mL, 18.7eq. and the mixture was stirred at 20° C. for 30 minutes. The mixturewas then concentrated under reduced pressure and the pH was adjusted topH=7 with saturated sodium bicarbonate aqueous solution. The resultingmixture was extracted with a 10:1 solution of dichloromethane/methanol(50.0 mL), and the organic phases were dried and concentrated to give(R)-3-(1-aminoethyl)-2-methoxybenzonitrile (600 mg, crude) as brown oil.

¹H NMR (400 MHz, CDCl₃) δ=7.66 (dd, J=1.2, 7.6 Hz, 1H), 7.53 (dd, J=1.2,7.6 Hz, 1H), 7.17 (t, J=8.0 Hz, 1H), 4.52 (q, J=6.8 Hz, 1H), 4.13 (s,3H), 1.46 (d, J=6.4 Hz, 3H).

Step D: To a solution of 1,7-dichloro-4-methylpyrido[3,4-d]pyridazine(300 mg, 1.40 mmol, 1.00 eq.) in DMSO (5.00 mL) was added cesiumfluoride (319 mg, 2.10 mmol, 77.5 μL, 1.50 eq.) and(R)-3-(1-aminoethyl)-2-methoxybenzonitrile (247 mg, 1.40 mmol, 1.00 eq.and the mixture was stirred at 130° C. for 30 minutes. The reactionmixture was diluted with ethyl acetate (50.0 mL), washed with brine(20.0 mL×3), and the separated organic phase was dried and concentratedunder reduced pressure. The residue was purified by prep-HPLC [column:Phenomenex luna C18 150×40 mm×15 um; mobile phase: phase A: water (0.1%TFA), phase B: acetonitrile; B %: 14%-44%] to give(R)-3-(1-((7-chloro-4-methylpyrido[3,4-d]pyridazin-1-yl)amino)ethyl)-2-methoxybenzonitrile(200 mg, 565 μmol, 40.3% yield) as a yellow solid. LCMS [M+1]⁺: 354.1.

Step E: A mixture of(R)-3-(1-((7-chloro-4-methylpyrido[3,4-d]pyridazin-1-yl)amino)ethyl)-2-methoxybenzonitrile(30.0 mg, 84.8 μmol, 1.00 eq.), (S)-octahydropyrazino[2,1-c][1,4]oxazine(27.4 mg, 127 μmol, 1.50 eq., dihydrochloride salt),NN-diisopropylethylamine (32.9 mg, 254 μmol, 44.3 μL, 3.00 eq.) andcesium fluoride (19.3 mg, 127 μmol, 4.69 μL, 1.50 eq.) in DMSO (0.40 mL)was stirred at 130° C. for 2 hour under a nitrogen atmosphere. Themixture was then diluted with ethyl acetate (30.0 mL), washed with brine(10.0 mL×3), and the separated organic phase were dried and concentratedunder reduced pressure. The residue was purified by prep-HPLC [column:3_Phenomenex Luna C18 75×30 mm×3 um; mobile phase: phase A: water (0.05%HCl), phase B: acetonitrile; B %: 10%-30%] to give3-((R)-1-((7-((S)-hexahydropyrazino[2,1-c][1,4]oxazin-8(1H)-yl)-4-methylpyrido[3,4-d]pyridazin-1-yl)amino)ethyl)-2-methoxybenzonitrile(13.9 mg, 27.8 μmol, 32.8% yield, 99.3% purity, HCl salt) as a yellowsolid. LCMS [M+1]⁺: 460.2.

¹H NMR (400 MHz, CD₃OD) δ=9.35 (s, 1H), 7.91 (s, 1H), 7.79 (br d, J=7.6Hz, 1H), 7.65-7.53 (m, 1H), 7.21 (t, J=8.0 Hz, 1H), 5.66-5.54 (m, 1H),5.25-5.05 (m, 2H), 4.29-4.14 (m, 5H), 4.08-3.97 (m, 1H), 3.86-3.62 (m,4H), 3.58 (br d, J=11.2 Hz, 1H), 3.52-3.35 (m, 3H), 2.86 (s, 3H), 1.71(d, J=6.8 Hz, 3H).

Following the teachings of the General Reaction Scheme III, and theprocedure described for the preparation of Examples 17-1-17-2, thefollowing compounds of Formula (I), Examples 17-3-17-4 shown in Table 17were prepared.

TABLE 17 Ex. # Structure Spectral Data 17-3

¹H NMR (400 MHz, CD₃OD) δ = 8.96 (s, 1H), 7.67 (dd, J = 1.6, 8.0 Hz,1H), 7.52 (dd, J = 1.6, 7.6 Hz, 1H), 7.15 (t, J = 8.0 Hz, 1H), 7.07 (s,1H), 5.69 (q, J = 6.8 Hz, 1H), 4.24 (s, 3H), 4.17-4.05 (m, 4H), 2.63 (s,3H), 1.66-1.59 (m, 6H). LCMS [M + 1] ⁺: 405.2.(R)-3-(1-((7-(3-hydroxy-3-methylazetidin-1-yl)-4-methylpyrido[3,4-d]pyridazin-1- yl)amino)ethyl)-2-methoxybenzonitrile17-4

¹H NMR (400 MHz, CD₃OD) δ = 7.86 (br d, J = 9.2 Hz, 1H), 7.67 (dd, J =1.6, 7.6 Hz, 1H), 7.48 (dd, J = 1.6, 7.6 Hz, 1H), 7.16 (s, 1H), 7.11 (t,J = 8.0 Hz, 1H), 7.08-7.03 (m, 1H), 5.70 (q, J = 6.8 Hz, 1H), 4.23 (s,3H), 4.05 (br d, J = 8.0 Hz, 2H), 3.95 (br d, J = 8.4 Hz, 2H), 2.59 (s,3H), 1.63-1.59 (m, 6H). LCMS [M + 1] ⁺: 404.3.(R)-3-(1-((7-(3-hydroxy-3-methlazetidin-1-yl)-4-methylpyridazin-1-yl)amino)ethyl)-2- methoxybenzonitrile

Example 18-1(R)-6-fluoro-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(piperazin-1-yl)phthalazin-1-amine

Step A: To a solution of methyl 5-bromo-4-fluoro-2-iodobenzoate (1.50 g,4.18 mmol, 1.00 eq.) and tributyl(1-ethoxyvinyl)tin (1.52 g, 4.22 mmol,1.42 mL, 1.01 eq.) in dioxane (20.0 mL) was added Pd(PPh₃)₂Cl₂ (60.0 mg,0.08 mmol, 0.02 eq.) under a nitrogen atmosphere. The reaction mixturewas stirred at 80° C. for 12 hours under a nitrogen atmosphere. Thereaction mixture was cooled to 25° C., quenched by addition of saturatedaqueous potassium fluoride (100 mL) and extracted with ethyl acetate(200 mL×3). The combined organic layers were washed with brine (200mL×3), dried over sodium sulfate, filtered, and concentrated underreduced pressure to give compound methyl5-bromo-2-(1-ethoxyvinyl)-4-fluorobenzoate (2.00 g, crude) as a brownoil which was used in next step directly.

To a solution of methyl 5-bromo-2-(1-ethoxyvinyl)-4-fluorobenzoate (2.00g, crude) in THF (50.0 mL) was added hydrochloric acid aqueous solution(4.00 M, 10.0 mL, 6.06 eq). The mixture was stirred at 25° C. for 2hours, then diluted with water (50.0 mL) and extracted with ethylacetate (50.0 mL×3). The combined organic layers were washed with brine(20.0 mL), dried over sodium sulfate, filtered, and concentrated underreduced pressure to give a residue. The residue was purified by columnchromatography (petroleum ether/ethyl acetate=10/1 to 1/1) to givecompound methyl 2-acetyl-5-bromo-4-fluorobenzoate (700 mg, 2.54 mmol,38.6% yield) as a yellow oil.

¹H NMR (400 MHz, CDCl₃) δ=8.14 (d, J=6.4 Hz, 1H), 7.12 (d, J=8.0 Hz,1H), 3.91 (s, 3H), 2.52 (s, 3H).

Step B: To a solution of methyl 2-acetyl-5-bromo-4-fluorobenzoate (700mg, 2.54 mmol, 1.00 eq.) in ethanol (10.0 mL) was added hydrazinehydrate (130 mg, 2.54 mmol, 98% purity, 1.00 eq.) dropwise. The reactionmixture was stirred at 95° C. for 30 minutes, then cooled to 25° C. andconcentrated under reduced pressure to give7-brorno-6-fluoro-4-methylphthalazin-1-ol (460 mg, 1.79 mmol, 70.3%yield) as a white solid.

¹H NMR (400 MHz, CDCl₃) δ=12.62 (s, 1H), 8.46 (d, J=7.2 Hz, 1H), 7.94(d, J=9.6 Hz, 1H), 2.48 (s, 3H).

Step C: A mixture of 7-bromo-6-fluoro-4-methylphthalazin-1-ol (250 mg,0.97 mmol, 1.00 eq.) in phosphorus (V) oxychloride (9.52 g, 62.1 mmol,5.77 mL, 63.8 eq.) was stirred at 110° C. for 2 hours. The reactionmixture was cooled to 25° C. and concentrated under reduced pressure togive a residue. The residue was diluted with ethyl acetate (30.0 mL) andthe pH was adjusted to pH=7 by slow addition of saturated sodiumbicarbonate (aqueous solution). The organic phase was washed with brine(20.0 mL×2), dried over anhydrous sodium sulfate, filtered, andconcentrated under reduced pressure. The crude product was purified byprep-TLC (petroleum ether/ethyl acetate=3/1) to give6-bromo-4-chloro-7-fluoro-1-methylphthalazine (170 mg, 617 μmol, 63.5%yield) as a yellow solid. LCMS [M+3]⁺: 276.7.

Step D: To a solution of 6-bromo-4-chloro-7-fluoro-1-methylphthalazine(170 mg, 0.62 mmol, 1.00 eq.) and(R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethan-1-amine (126 mg, 0.62mmol, 1.00 eq.) in DMSO (5.00 mL) was added potassium fluoride (180 mg,3.09 mmol, 5.00 eq.). The mixture was stirred at 130° C. for 12 hoursthen cooled to 25° C., quenched by addition water (10.0 mL), andextracted with ethyl acetate (20.0 mL×3). The combined organic layerswere washed with brine (20.0 mL×3), dried over sodium sulfate, filtered,and concentrated under reduced pressure to give a residue. The residuewas purified by prep-TLC (dichloromethane/methanol=20/1) to givecompound(R)-7-bromo-6-fluoro-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine(80.0 mg, 0.18 mmol, 29.3% yield) as a yellow oil. LCMS [M+3]⁺: 444.0.

Step E: To a solution of(R)-7-bromo-6-fluoro-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine(80.0 mg, 0.18 mmol, 1.00 eq.) and piperazine (32.0 mg, 0.36 mmol, 2.00eq.) in dioxane (3.00 mL) were added Pd₂(dba)₃ (16.0 mg, 0.02 mmol, 0.10eq.), RuPhos (16.0 mg, 0.04 mmol, 0.20 eq.) and cesium carbonate (300mg, 0.90 mmol, 5.00 eq.) under a nitrogen atmosphere. The reactionmixture was stirred at 100° C. for 12 hours under a nitrogen atmosphere,then cooled to 25° C., quenched by addition water (10.0 mL), andextracted with ethyl acetate (20.0 mL×3). The combined organic layerswere washed with brine (20.0 mL×3), dried over sodium sulfate, filtered,and concentrated under reduced pressure. The residue was purified byprep-TLC (dichloromethane/methanol=10/1) and then purified by prep-HPLC[column: Phenomenex luna C18 150×25 mm×10 um; mobile phase: phase A:water (0.225% formic acid), phase B: acetonitrile; B %: 3%-33%] to give(R)-6-fluoro-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(piperazin-1-yl)phthalazin-1-amine(8.97 mg, 0.02 mmol, 9.15% yield, 91.1% purity, formate salt) as ayellow solid. LCMS [M+1]⁺: 448.2.

¹H NMR (400 MHz, DMSO-d₆) δ=8.30 (s, 1H), 7.86 (d, J=8.4 Hz, 1H), 7.76(d, J=7.6 Hz, 1H), 7.68 (d, J=14.0 Hz, 1H), 7.61 (d, J=6.8 Hz, 1H), 7.52(d, J=7.6 Hz, 1H), 7.30 (t, J=7.6 Hz, 1H), 5.70-5.65 (m, 1H), 3.21 (s,4H), 3.00 (s, 4H), 2.57 (s, 3H), 2.52 (s, 3H), 1.55 (d, J=12 Hz, 3H).

SFC conditions: Column: Chiralcel OD-3 50×4.6 mm I.D., 3 um Mobilephase: Phase A: CO₂, Phase B: MeOH (0.05% diethylamine); Gradientelution: MeOH (0.05% diethylamine) in CO₂ from 5% to 40% Flow rate: 3mL/min; Detector: PDA; Column Temp: 35 C; Back Pressure: 100 Bar.

Example 18-2(R)-6-fluoro-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-morpholinophthalazin-1-amine

To a solution of(R)-7-bromo-6-fluoro-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine(60.0 mg, 136 μmol, 1.00 eq.) in dioxane (3.00 mL) were added morpholine(23.6 mg, 271 μmol, 23.9 μL, 2.00 eq.), RuPhos (12.7 mg, 27.1 μmol, 0.20eq.), Pd₂(dba)₃ (12.4 mg, 13.6 μmol, 0.10 eq.) and cesium carbonate(88.4 mg, 271 μmol, 2.00 eq.) under a nitrogen atmosphere, and themixture was at 110° C. for 2 hours. The reaction mixture was cooled to25° C., poured into water (10.0 mL), and extracted with ethyl acetate(10.0 mL×3). The combined organic layers were washed with brine (10.0mL), dried over sodium sulfate, filtered, and concentrated under reducedpressure. The residue was purified by prep-TLC (Silica gel plate,petroleum ether/ethyl acetate=2/1) and further purified by prep-HPLC[column: Phenomenex luna C18 150×25 mm×10 um; mobile phase: phase A:water(0.225% formic acid), phase B: acetonitrile, B %: 20%-50%] to give(R)-6-fluoro-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-morpholinophthalazin-1-amine(4.92 mg, 10.7 μmol, 7.89% yield, 97.6% purity, formate salt) as anoff-white solid. LCMS [M+1]⁺: 449.0.

¹H NMR (400 MHz, DMSO-d₆) δ=8.27 (s, 1H), 7.87 (d, J=8.4 Hz, 1H), 7.76(d, J=7.6 Hz, 1H), 7.71 (d, J=14.0 Hz, 1H), 7.59 (d, J=7.2 Hz, 1H), 7.52(d, J=7.6 Hz, 1H), 7.32 (t, J=8.0 Hz, 1H), 5.76-5.61 (m, 1H), 3.86-3.81(m, 4H), 3.27-3.23 (m, 4H), 2.58 (s, 3H), 2.54 (s, 3H), 1.56 (d, J=6.8Hz, 3H).

SFC conditions: Chiralcel OD-3 50×4.6 mm I.D., 3 um Mobile phase: PhaseA: CO₂, and Phase B: MeOH (0.05% diethylamine); Gradient elution: MeOH(0.05% diethylamine) in CO₂ from 5% to 40% Flow rate: 3 mL/min;Detector: PDA; Column Temp: 35 C; Back Pressure: 100 Bar.

Following the teachings of the General Reaction Scheme III, and theprocedure described for the preparation of Examples 18-1-18-2, thefollowing compounds of Formula (I), Examples 18-3-18-5 shown in Table 18were prepared.

TABLE 18 Ex. # Structure Spectral Data 18-3

¹H NMR (400 MHz, DMSO- d₆) δ 7.82 (d, J = 8.5 Hz, 1H), 7.75 (d, J = 7.9Hz, 1H), 7.67 (d, J = 13.8 Hz, 1H), 7.60 (dd, J = 7.7, 1.3 Hz, 1H), 7.56(d, J = 6.7 Hz, 1H), 7.31 (t, J = 7.8 Hz, 1H), 5.57 (q, J = 6.9 Hz, 1H),3.27-3.23 (m, 4H), 2.66 (s, 3H), 2.57-2.53 (m, 4H), 2.52 (s, 3H), 2.27(s, 3H), 1.54 (d, J = 7.0 Hz, 3H). LCMS [M + 1] ⁺: 419.3.(R)-3-(1-((6-fluoro-4-methyl-7-(4- methylpiperazin-1-yl)phthalazin-1-yl)amino)ethyl)-2-methylbenzonitrile 18-4

¹H NMR (400 MHz, DMSO- d₆) δ 7.81 (d, J = 8.5 Hz, 1H), 7.75 (d, J = 7.9Hz, 1H), 7.66 (d, J = 13.7 Hz, 1H), 7.62- 7.54 (m, 2H), 7.31 (t, J = 7.8Hz, 1H), 5.62-5.53 (m, 1H), 3.29 (s, 3H), 3.19-3.11 (m, 4H), 2.94-2.88(m, 4H), 2.67 (s, 3H), 1.54 (d, J = 7.0 Hz, 3H). LCMS [M + 1] ⁺: 405.1.(R)-3-(1-((6-fluoro-4-methyl-7-(piperazin-1-yl)phthalazin-1-yl)amino)ethyl)-2- methylbenzonitrile 18-5

¹H NMR (400 MHz, CD₃OD) δ 7.84 (d, J = 8.3 Hz, 1H), 7.72 (d, J = 7.8 Hz,1H), 7.66 (d, J = 13.5 Hz, 1H), 7.49 (d, J = 7.8 Hz, 1H), 7.24 (t, J =7.8 Hz, 1H), 5.74 (q, J = 6.9 Hz, 1H), 3.33-3.31 (m, 4H), 2.74- 2.69 (m,4H), 2.62 (s, 3H), 2.60 (s, 3H), 2.42 (s, 3H), 1.64 (d, J = 6.9 Hz, 3H).LCMS [M + 1] ⁺: 462.2. (R)-6-fluoro-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)-7-(4-methylpiperazin-1-yl)phthalazin-1-amine

Example 19-1 (R)-3-(1-((7-(3-(dimethyl amino)-3-methylazetidin-1-yl)-4-methyl-6-(trifluoromethyl)phthalazin-1-yl)amino)ethyl)-2-methylbenzonitrile

Step A: To a solution of methyl 2-amino-4-(trifluoromethyl)benzoate(3.00 g, 13.7 mmol, 1.00 eq.) in AA-dimethylformamide (50.0 mL) wasadded A-bromosuccinimide (2.68 g, 15.1 mmol, 1.10 eq.) and the mixturewas stirred at 20° C. for 12 hours under a nitrogen atmosphere. Thereaction mixture was poured into water (50.0 mL), and then extractedwith ethyl acetate (50.0 mL×3), and the combined organic layers werewashed with brine (40.0 mL), dried over sodium sulfate, filtered, andconcentrated under reduced pressure. The residue was purified by columnchromatography (silica gel, petroleum ether/ethyl acetate=50/1 to 10/1)to give methyl 2-amino-5-bromo-4-(trifluoromethyl)benzoate (3.30 g, 11.1mmol, 80.9% yield) as yellow solid.

¹H NMR (400 MHz, DMSO-d₆): δ=8.06 (s, 1H), 6.93 (s, 1H), 5.86 (s, 2H),3.84 (s, 3H).

Step B: To a solution of 2-amino-5-bromo-4-(trifluoromethyl)benzoate(3.30 g, 11.1 mmol, 1.00 eq.) in hydrochloric acid (4.00 M, 100 mL, 36.1eq.) was added sodium nitrite (917 mg, 13.3 mmol, 1.20 eq.) at 0° C.,and the mixture was stirred at 0° C. for 1 hour under a nitrogenatmosphere. Potassium iodide (3.68 g, 22.1 mmol, 2.00 eq.) was thenadded in portionwise to the reaction mixture at 0° C., and the mixturewas slowly heated to 90° C. and stirred for 11 hours under a nitrogenatmosphere. The mixture was cooled 25° C., extracted with ethyl acetate(100 mL×3), and the combined organic layers were washed with brine (50.0mL), dried over sodium sulfate, filtered, and concentrated under reducedpressure. The residue was purified by column chromatography (silica gel,petroleum ether/ethyl acetate=100/1 to 20/1) to give methyl5-bromo-2-iodo-4-(trifluoromethyl)benzoate (4.10 g, 10.0 mmol, 90.5%yield) as a yellow solid.

¹H NMR (400 MHz, CDCl₃) δ=8.16 (s, 1H), 8.01 (s, 1H), 3.90 (s, 3H).

Step C: To a solution of methyl5-bromo-2-iodo-4-(trifluoromethyl)benzoate (3.60 g, 8.80 mmol, 1.00 eq.)and 1-(vinyloxy)butane (1.06 g, 10.6 mmol, 1.36 mL, 1.20 eq.),N,N-dimethylformamide (10.0 mL) were added DPPF (244 mg, 440 μmol, 0.05eq.), NN-diethylethanamine (2.67 g, 26.4 mmol, 3.68 mL, 3.00 eq.) andpalladium (II) acetate (59.3 mg, 264 μmol, 0.03 eq.), and the mixturewas stirred at 70° C. for 12 hours under a nitrogen atmosphere. Themixture was then cooled to 25° C., diluted with tetrahydrofuran (17.8 g,247 mmol, 20.0 mL, 14.9 eq.) followed by hydrochloric acid (4.00 M, 20.0mL, 4.82 eq.), and the mixture was stirred at 20° C. for 1 hour. Themixture was poured into water (30.0 mL), extracted with ethyl acetate(30.0 mL×3), and the combined organic layers were washed with brine(30.0 mL), dried over sodium sulfate, filtered, and concentrated underreduced pressure. The residue was purified by column chromatography(silica gel, petroleum ether/ethyl acetate=50/1 to 10/1) to give methyl2-acetyl-5-bromo-4-(trifluoromethyl)benzoate (250 mg, 769 μmol, 8.74%yield) as a yellow solid.

¹H NMR (400 MHz, CDCl₃) δ=8.08 (s, 1H), 7.68 (s, 1H), 3.87 (s, 3H), 2.49(s, 3H).

Step D: To a solution of methyl2-acetyl-5-bromo-4-(trifluoromethyl)benzoate (250 mg, 769 μmol, 1.00eq.) in ethanol (5.00 mL) was added hydrazine hydrate (46.2 mg, 923μmol, 44.8 μL, 98%, 1.20 eq.) and the mixture was stirred at 95° C. for030 minutes under a nitrogen atmosphere. The mixture was cooled to 25°C. and concentrated under reduced pressure to give7-bromo-4-methyl-6-(trifluoromethyl)phthalazin-1-ol (170 mg, crude) as ayellow solid which was used without further purification. LCMS [M+3]⁺:309.1.

Step E: A solution of7-bromo-4-methyl-6-(trifluoromethyl)phthalazin-1-ol (50.0 mg, 162.8μmol, 1.00 eq.) in POCl₃ (4.95 g, 32.3 mmol, 3.00 mL, 198 eq.) wasstirred at 110° C. for 1 hour under a nitrogen atmosphere. The mixturewas cooled to 25° C., diluted with ethyl acetate (50.0 mL), and thenquenched by addition saturated sodium bicarbonate (aqueous solution,50.0 mL). The solution was extracted with ethyl acetate (50.0 mL×3), andthe combined organic layers were washed with brine (40.0 mL), dried oversodium sulfate, filtered, and concentrated under reduced pressure togive a residue. The residue was purified by prep-TLC (silica gel plate,petroleum ether/ethyl acetate=1/1) to give6-bromo-4-chloro-1-methyl-7-(trifluoromethyl)phthalazine (20.0 mg, 61.4μmol, 37.7% yield) as a brown oil. LCMS [M+3]⁺: 326.7.

Step F: To a solution of7-bromo-4-chloro-1-methyl-7-(trifluoromethyl)phthalazine (120 mg, 369μmol, 1.00 eq.) and (R)-3-(1-aminoethyl)-2-methylbenzonitrile (59.0 mg,369 μmol, 1.00 eq.) in dimethyl sulfoxide (3.00 mL) was added potassiumfluoride (107 mg, 1.84 mmol, 43.2 μL, 5.00 eq.), and the reaction wasstirred at 130° C. for 12 hours under a nitrogen atmosphere. Thereaction mixture was cooled to 25° C., poured into water (10.0 mL), andextracted with ethyl acetate (10.0 mL×3). The combined organic layerswere washed with brine (10.0 mL), dried over sodium sulfate, filtered,and concentrated under reduced pressure. The residue was purified byprep-TLC (silica gel plate, dichloromethane/methyl alcohol=10/1) to give(R)-3-(1-((7-bromo-4-methyl-6-(trifluoromethyl)phthalazin-1-yl)amino)ethyl)-2-methylbenzonitrile(110 mg, 244 μmol, 66.4% yield) as a light yellow solid. LCMS [M+3]⁺:451.2.

Step G: To a solution ofR)-3-(1-((7-bromo-4-methyl-6-(trifluoromethyl)phthalazin-1-yl)amino)ethyl)-2-methylbenzonitrile(30.0 mg, 0.07 mmol, 1.00 eq.) and N,N, 3-trimethylazetidin-3-amine(20.0 mg, 0.13 mmol, 2.00 eq., HCl salt) in dioxane (2.00 mL) was addedPd₂(dba)₃ (6.00 mg, 0.10 eq.), RuPhos (6.00 mg, 0.20 eq.) and cesiumcarbonate (108 mg, 0.33 mmol, 5.00 eq.) was stirred at 100° C. for 12hours under a nitrogen atmosphere. The reaction mixture was cooled to25° C., quenched by addition of water (20.0 mL), and extracted withethyl acetate (20.0 mL×3). The combined organic layers were washed withbrine (20.0 mL×3), dried over sodium sulfate, filtered, and concentratedunder reduced pressure. The residue was purified by prep-HPLC [column:Waters xbridge 150×25 mm×10 um; mobile phase: phase A: water(10 mMNH₄HCO₃), phase B: acetonitrile; B %: 38%-68%] to give(R)-3-(1-((7-(3-(dimethylamino)-3-methylazetidin-1-yl)-4-methyl-6-(trifluoromethyl)phthalazin-1-yl)amino)ethyl)-2-methylbenzonitrile(3.28 mg, 9.91% yield, 97.4% purity) as a yellow solid. LCMS [M+1]⁺:483.4.

¹H NMR (400 MHz, DMSO-d₆) δ=8.06 (s, 1H), 7.74 (d, J=8.0 Hz, 1H), 7.60(d, J=7.2 Hz, 1H), 7.51 (d, J=6.8 Hz, 1H), 7.30 (t, J=7.6 Hz, 1H), 7.24(s, 1H), 5.58-5.53 (m, 1H), 4.00-3.95 (m, 2H), 3.90-3.86 (m, 2H), 2.66(s, 3H), 2.55 (s, 3H), 2.16 (s, 6H), 1.56 (d, J=7.2 Hz, 3H), 1.33 (s,3H).

SFC conditions: Column: Chiralpak AS-3 50×4.6 mm I.D, 3 um Mobile phase:Phase A: CO₂, and Phase B: MeOH (0.05% diethylamine); Gradient elution:MeOH (0.05% diethylamine) in CO₂ from 5% to 40% Flow rate: 3 mL/min;Detector: PDA; Column Temp: 35C; Back Pressure: 100 Bar.

Example 19-2(R)-2-methyl-3-(1-((4-methyl-7-morpholino-6-(trifluoromethyl)phthalazin-1-yl)amino)ethyl)benzonitrile

To a solution of(R)-3-(1-((7-bromo-4-methyl-6-(trifluoromethyl)phthalazin-1-yl)amino)ethyl)-2-methylbenzonitrile(40.0 mg, 89.0 μmol, 1.00 eq.) and morpholine (22.0 mg, 178 μmol, 22.2μL, 2.00 eq.) in dioxane (3.00 mL) were added cesium carbonate (58.0 mg,178 μmol, 2.00 eq.), Pd₂(dba)₃ (8.15 mg, 8.90 μmol, 0.10 eq.) and RuPhos(8.31 mg, 17.8 μmol, 0.20 eq.) under a nitrogen atmosphere, and thereaction mixture was stirred at 105° C. for 12 hours. The mixture wasthen cooled to 25° C., poured into water (30.0 mL), and extracted withethyl acetate (30.0 mL×3). The combined organic layers were washed withwater (20.0 mL), dried over sodium sulfate, filtered, and concentratedunder reduced pressure. The residue was purified by prep-HPLC [column:Waters xbridge 150×25 mm 10 um; mobile phase: phase A: water 10 mMNH₄HCO₃), phase B: acetonitrile; B %: 37%-67%] to give(R)-2-methyl-3-(1-((4-methyl-7-morpholino-6-(trifluoromethyl)phthalazin-1-yl)amino)ethyl)benzonitrile(2.57 mg, 5.33 μmol, 5.99% yield, 94.5% purity) as a white solid. LCMS[M+1]⁺: 456.3.

¹H NMR (400 MHz, DMSO-d₆) δ=8.58 (s, 1H), 8.22 (s, 1H), 7.83 (d, J=6.4Hz, 1H), 7.75 (d, J=7.6 Hz, 1H), 7.62 (d, J=7.2 Hz, 1H), 7.33 (t, J=7.2Hz, 1H), 5.63-5.54 (m, 1H), 3.83-3.78 (m, 4H), 3.10-3.05 (m, 4H), 2.68(s, 3H), 2.66 (s, 3H), 1.58 (d, J=7.2 Hz, 3H).

SFC conditions: Column: Chiralpak AS-3 50×4.6 mm I.D., 3 um Mobilephase: Phase A: CO₂, and Phase B: MeOH (0.05% diethylamine); Gradientelution: MeOH (0.05% diethylamine) in CO₂ from 5% to 40% Flow rate: 3mL/min; Detector: PDA; Column Temp: 35 C; Back Pressure: 100 Bar.

Following the teachings of the General Reaction Scheme IV, and theprocedure described for the preparation of Examples 19-1-19-2, thefollowing compound of Formula (I), Example 19-3 shown in Table 19 wasprepared.

TABLE 19 Ex. # Structure Spectral Data 19-3

¹H NMR (400 MHz, DMSO- d₆) δ 8.06 (s, 1H), 7.74 (d, J = 7.8 Hz, 1H),7.60 (d, J = 7.6 Hz, 1H), 7.54 (d, J = 6.8 Hz, 1H), 7.31 (t, J = 7.8 Hz,1H), 7.23 (s, 1H), 5.69 (s, 1H), 5.60-5.52 (m, 1H), 4.11-4.00 (m, 4H),3.30 (s, 5H), 2.66 (s, 3H), 2.55 (s, 3H), 2.33 (d, J = 1.9 Hz, 1H), 1.55(d, J = 7.0 Hz, 3H), 1.51 (s, 3H). LCMS [M + 1]⁺: 456.4.(R)-3-(1-((7-(3-hydroxy-3-methylazetidin-1-yl)-4-methyl-6-(trifluoromethyl)phthalazin-1-yl)amino)ethyl)-2-methylbenzonitrile

Example 20-11-(3-((R)-1-((7-((1R,4R)-2-oxa-5-azabicyclo[2.2.1]heptan-5-yl)-4-methylpyrido[3,4-<7]pyridazin-1-yl)amino)ethyl)-2-fluorophenyl)-1,1-difluoro-2-methylpropan-2-ol

Step A: To a solution of 1-bromo-2-fluoro-3-iodobenzene (4.00 g, 13.3mmol, 1.00 eq.) and ethyl 2-bromo-2,2-difluoroacetate (3.80 g, 18.6mmol, 2.40 mL, 1.40 eq.) in dimethyl sulfoxide (50.0 mL) was addedcopper (2.53 g, 39.9 mmol, 3.00 eq.), and the mixture was stirred at 70°C. for 12 hours. The reaction mixture was cooled to 25° C., quenched byaddition water (100 mL) and extracted with ethyl acetate (200 mL×3). Thecombined organic layers were washed with brine (100 mL×3), dried oversodium sulfate, filtered, and concentrated under reduced pressure. Theresidue was purified by column chromatography (silica gel, petroleumether/ethyl acetate=10/1 to 5/1) to give ethyl2-(3-bromo-2-fluorophenyl)-2,2-difluoroacetate (2.00 g, 6.73 mmol, 50.6%yield) as a yellow oil.

¹H NMR (400 MHz, CDCl₃) δ=7.72-7.69 (m, 1H), 7.61-7.57 (m, 1H), 7.15 (t,J=8.0 Hz, 1H), 4.39-4.34 (m, 2H), 1.35-1.32 (m, 3H).

Step B: To a solution of ethyl2-(3-bromo-2-fluorophenyl)-2,2-difluoroacetate (2.00 g, 6.73 mmol, 1.00eq.) in tetrahydrofuran (30.0 mL) was added methylmagnesium bromidesolution (3.00 M, 6.75 mL, 3.00 eq.) at 0° C., and the mixture wasstirred at 0° C. for 2 hours. The mixture was then warmed to 25° C.,diluted with water (10.0 mL) and extracted with ethyl acetate (20.0mL×3). The combined organic layers were washed with brine (20.0 mL×3),dried over sodium sulfate, filtered, and concentrated under reducedpressure. The residue was purified by column chromatography (silica gel,petroleum ether/ethyl acetate=10/1 to 3/1) to give1-(3-bromo-2-fluorophenyl)-1,1-difluoro-2-methylpropan-2-ol (1.70 g,6.01 mmol, 89.2% yield) as a yellow oil.

¹H NMR (400 MHz, CDCl₃) δ=7.67-7.65 (m, 1H), 7.43-7.39 (m, 1H),7.12-7.09 (m, 1H), 1.35 (d, J=0.8 Hz, 6H).

Step C: To a solution of1-(3-bromo-2-fluorophenyl)-1,1-difluoro-2-methylpropan-2-ol (1.50 g,5.30 mmol, 1.00 eq.) and tributyl(1-ethoxyvinyl)tin (3.83 g, 10.6 mmol,3.58 mL, 2.00 eq.) in 1,4-dioxane (15.0 mL) was added PdCl₃ (PPh₃)₂ (380mg, 0.53 mmol, 0.10 eq.), and the mixture was stirred at 80° C. for 12hours under a nitrogen atmosphere. The reaction mixture was then cooledto 25° C., diluted with saturated potassium fluoride solution (100 mL)and extracted with ethyl acetate (200 mL×3). The combined organic layerswere washed with brine (200 mL×3), dried over sodium sulfate, filtered,and concentrated under reduced pressure to give1-(3-(1-ethoxyvinyl)-2-fluorophenyl)-1,1-difluoro-2-methylpropan-2-ol(2.00 g, crude) as a black oil. A solution of1-(3-(1-ethoxyvinyl)-2-fluorophenyl)-1,1-difluoro-2-methylpropan-2-ol(2.00 g, 7.29 mmol, 1.00 eq.) in tetrahydrofuran (20.0 mL) was addedhydrochloride (4.00 M, 10.0 mL), and the mixture was stirred at 25° C.for 1 hour. The reaction mixture was quenched by addition water (100 mL)and extracted with ethyl acetate (200 mL×3). The combined organic layerswere washed with brine (200 mL×3), dried over sodium sulfate, filtered,and concentrated under reduced pressure. The residue was purified bycolumn chromatography (silica gel, petroleum ether/ethyl acetate=10/1 to1/1) to give1-(3-(1,1-difluoro-2-hydroxy-2-methylpropyl)-2-fluorophenyl)ethan-1-one(1.50 g, 6.09 mmol, 83.5% yield) as a yellow oil.

¹H NMR (400 MHz, CDCl₃) δ=7.97-7.91 (m, 1H), 7.66-7.61 (m, 1H),7.31-7.27 (m, 1H), 2.66 (d, J=4.0 Hz, 3H), 1.37 (d, J=1.2 Hz, 6H).

Step D: To a solution of1-(3-(1,1-difluoro-2-hydroxy-2-methylpropyl)-2-fluorophenyl)ethan-1-one(1.50 g, 6.09 mmol, 1.00 eq.) and (R)-2-methylpropane-2-sulfinamide(2.22 g, 18.3 mmol, 3.00 eq.) in tetrahydrofuran (10.0 mL) was addedtitanium (IV) isopropoxide (3.46 g, 12.2 mmol, 3.60 mL, 2.00 eq.) and1-methoxy-2-(2-methoxyethoxy)ethane (1.63 g, 12.2 mmol, 1.74 mL, 2.00eq.), and the mixture was stirred at 70° C. for 6 hours under a nitrogenatmosphere. The mixture was then cooled to 25° C., diluted with water(50.0 mL) and extracted with ethyl acetate (50.0 mL×3). The combinedorganic layers were washed with brine (50.0 mL×3), dried over sodiumsulfate, filtered, and concentrated under reduced pressure. The residuewas purified by column chromatography (silica gel, petroleum ether/ethylacetate=10/1 to 1/1) to give(R)—N-(1-(3-(1,1-difluoro-2-hydroxy-2-methylpropyl)-2-fluorophenyl)ethylidene)-2-methylpropane-2-sulfinamide(1.50 g, 4.29 mmol, 70.1% yield) as a yellow oil.

¹H NMR (400 MHz, CDCl₃) δ=7.73-7.68 (m, 1H), 7.60-7.52 (m, 1H),7.26-7.22 (m, 1H), 1.37-1.35 (m, 3H), 1.32 (s, 6H), 1.24 (s, 9H)

Step E: To a solution of (R)—N-(1-(3-(1,1-difluoro-2-hydroxy-2-methylpropyl)-2-fluorophenyl)ethylidene)-2-methylpropane-2-sulfinamide (1.50g, 4.29 mmol, 1.00 eq.) in tetrahydrofuran (10.0 mL) was added sodiumboron hydrocarbon (488 mg, 12.9 mmol, 3.00 eq.) at 0° C. slowly, and themixture was stirred at 0° C. for 12 hours. The mixture was then dilutedwith water (50.0 mL) and extracted with ethyl acetate (100 mL×3). Thecombined organic layers were washed with brine (50.0 mL×3), dried oversodium sulfate, filtered, and concentrated under reduced pressure. Theresidue was purified by column chromatography (silica gel, petroleumether/ethyl acetate=10/1 to 1/1) to give(R)—N-(1-(3-(1,1-difluoro-2-hydroxy-2-methylpropyl)-2-fluorophenyl)ethyl)-2-methylpropane-2-sulfinamide(1.30 g, 3.70 mmol, 86.2% yield) as a yellow oil.

¹H NMR (400 MHz, CDCl₃)<5=7.45-7.27 (m, 2H), 7.16-7.10 (m, 1H),4.60-4.55 (m, 1H), 3.66-3.58 (m, 1H), 1.30-1.26 (m, 3H), 1.16 (s, 6H),1.14-1.10 (m, 9H).

Step F: To a solution of(R)—N-(1-(3-(1,1-difluoro-2-hydroxy-2-methylpropyl)-2-fluorophenyl)ethyl)-2-methylpropane-2-sulfinamide(600 mg, 1.71 mmol, 1.00 eq.) in dichloromethane (5.00 mL) was addedhydrochloride (4.00 M, 5.00 mL), and the mixture was stirred at 25° C.for 30 minutes. The mixture was then concentrated under reduced pressureto give1-(3-(1-aminoethyl)-2-fluorophenyl)-1,1-difluoro-2-methylpropan-2-ol(400 mg, 1.41 mmol, 82.3% yield, hydrochloride salt) as a yellow oil.

Step G: To a solution of1-(3-(1-aminoethyl)-2-fluorophenyl)-1,1-difluoro-2-methylpropan-2-ol(200 mg, 0.81 mmol, 1.00 eq.) and1,7-dichloro-4-methylpyrido[3,4-d]pyridazine (175 mg, 0.81 mmol, 1.00eq.) in dimethyl sulfoxide (2.00 mL) was added potassium fluoride (235mg, 4.04 mmol, 5.00 eq.), and the mixture was stirred at 130° C. for 12hours. The mixture was then cooled to 25° C., diluted with water (10.0mL), and extracted with ethyl acetate (10.0 mL×3). The combined organiclayers were washed with brine (10.0 mL), dried over sodium sulfate,filtered, and concentrated under reduced pressure. The residue waspurified by prep-HPLC [column: Welch Xtimate C18 150×25 mm×5 um; mobilephase: phase A: water (0.05% HCl), phase B: acetonitrile; B %: 14%-44%]to give1-(3-(1-((7-chloro-4-methylpyrido[3,4-d]pyridazin-1-yl)amino)ethyl)-2-fluorophenyl)-1,1-difluoro-2-methylpropan-2-ol(140 mg, 321 μmol, 39.7% yield, 97.5% purity) as a yellow solid. LCMS[M+1]⁺: 425.0.

Step H: The solid1-[3-[1-[(7-chloro-4-methyl-pyrido[3,4-d]pyridazin-1-yl)amino]ethyl]-2-fluoro-phenyl]-1,1-difluoro-2-methyl-propan-2-ol(140 mg, 330 μmol, 1.00 eq.) was separated into two enantiomers via SFCpurification [column: REGIS(S,S)WHELK-O1 (250 mm×25 mm, 10 um); mobilephase: phase A: 0.1% NH₄OH in IP A, phase B: CO₂; B %: 55%-55%] to give(R)-1-(3-(1-((7-chloro-4-methylpyrido[3,4-d]pyridazin-1-yl)amino)ethyl)-2-fluorophenyl)-1,1-difluoro-2-methylpropan-2-ol(first eluting isomer, 70.0 mg, 0.16 mmol, 50.0% yield) as a yellowsolid.

SFC characterization: Column: (S,S)Whelk-O1 50×4.6 mm I.D., 1.8 umMobile phase: Phase A: for CO₂, and Phase B: IPA (0.05% diethylamine);Gradient elution: 40% IPA (0.05% diethylamine) in CO₂Flow rate: 3mL/min; Detector: PDA; Column Temp: 35° C.; Back Pressure: 100 Bar.

Step I: To a solution of(R)-1-(3-(1-((7-chloro-4-methylpyrido[3,4-d]pyridazin-1-yl)amino)ethyl)-2-fluorophenyl)-1,1-difluoro-2-methylpropan-2-ol(20.0 mg, 0.05 mmol, 1.00 eq.) and(1R,4R)-2-oxa-5-azabicyclo[2.2.1]heptane (12.8 mg, 0.09 mmol, 2.00 eq.,hydrochloride salt) in 1,4-dioxane (1.50 mL) was added Pd₂(dba)₃ (4.31mg, 4.71 μmol, 0.10 eq.), RuPhos (4.39 mg, 9.42 μmol, 0.20 eq.) andcesium carbonate (76.8 mg, 0.24 mmol, 5.00 eq.), and the mixture wasstirred at 100° C. for 12 hours under a nitrogen atmosphere. The mixturewas cooled to 25° C., diluted with water (10.0 mL) and extracted withethyl acetate (20.0 mL×3). The combined organic layers were washed withbrine (20.0 mL), dried over sodium sulfate, filtered, and concentratedunder reduced pressure. The residue was purified by prep-HPLC [column:Waters xbridge 150×25 mm 10 um; mobile phase: phase A: water (10 mMNH₄HCO₃), phase B: acetonitrile; B %: 20%-50%] to give1-(3-((R)-1-((7-((1R,4R)-2-oxa-5-azabicyclo[2.2.1]heptan-5-yl)-4-methylpyrido[3,4-d]pyridazin-1-yl)amino)ethyl)-2-fluorophenyl)-1,1-difluoro-2-methylpropan-2-ol(11.4 mg, 0.02 mmol, 48.6% yield, 97.6% purity) as a yellow solid. LCMS[M+1]⁺: 488.3.

¹H NMR (400 MHz, DMSO-d) 3=8.97 (s, 1H), 7.51-7.46 (m, 1H), 7.36 (d,J=8.0 Hz, 1H), 7.30-7.26 (m, 1H), 7.20-7.14 (m, 2H), 5.72-5.63 (m, 1H),5.34 (s, 1H), 5.08 (s, 1H), 4.78 (s, 1H), 3.88 (d, J=8.0 Hz, 1H), 3.72(d, J=8.0 Hz, 1H), 3.62 (d, J=12.0 Hz, 1H), 3.40 (d, J=8.0 Hz, 1H), 2.55(s, 3H), 2.02-1.93 (m, 2H), 1.58 (d, J=4.0 Hz, 3H), 1.22 (d, J=4.0 Hz,6H).

SFC conditions: Column: Chiralpak AS-3 50×4.6 mm I.D., 3 um Mobilephase: Phase A: CO₂, and Phase B: MeOH (0.05% diethylamine); Gradientelution: MeOH (0.05% diethylamine) in CO₂ from 5% to 40% Flow rate: 3mL/min; Detector: PDA; Column Temp: 35° C.; Back Pressure: 100 Bar.

Following the teachings of the General Reaction Scheme III, and theprocedure described for the preparation of Example 20-1, the followingcompounds of Formula (I), Examples 20-2-20-3 shown in Table 20 wereprepared.

TABLE 20 Ex. # Structure Spectral Data 20-2

1,1-difluoro-1-(2-fluoro-3-((R)-1-((7-((S)-hexahydropyrazino[2,1-c][1,4]oxazin-8(1H)-yl)-4-methylpyrido[3,4-d]pyridazin-1-yl)amino)ethyl)phenyl)-2-methylpropan-2-ol ¹H NMR (400 MHz, DMSO- d₆) δ9.00 (s, 1H), 7.49 (t, J = 7.1 Hz, 1H), 7.46-7.41 (m, 2H), 7.29 (t, J =7.2 Hz, 1H), 7.16 (t, J = 7.7 Hz, 1H), 5.71- 5.63 (m, 1H), 5.35 (s, 1H),4.46 (d, J = 12.6 Hz, 1H), 4.39 (d, J = 12.3 Hz, 1H), 3.87-3.77 (m, 2H),3.64-3.54 (m, 1H), 3.28- 3.21 (m, 1H), 3.14-3.04 (m, 1H), 2.93 (d, J =11.4 Hz, 1H), 2.78-2.70 (m, 1H), 2.65-2.58 (m, 1H), 2.57 (s, 3H), 2.32-2.17 (m, 2H), 1.59 (d, J = 7.0 Hz, 3H), 1.24 (s, 4H), 1.23 (s, 3H). LCMS[M + 1] ⁺: 531.3. 20-3

¹H NMR (400 MHz, DMSO- d₆) δ 9.06 (s, 1H), 7.56-7.47 (m, 2H), 7.32-7.25(m, 2H), 7.16 (t, J = 7.7 Hz, 1H), 5.75- 5.67 (m, 1H), 5.35 (s, 1H),4.82 (d, J = 6.4 Hz, 2H), 3.96-3.87 (m, 2H), 3.78-3.68 (m, 2H),3.24-3.16 (m, 1H), 2.59 (s, 3H), 1.96 (d, J = 8.8 Hz, 1H), 1.59 (d, J =7.0 Hz, 3H), 1.24 (s, 3H), 1.23 (s, 3H). LCMS [M + 1] ⁺: 488.4.1-(3-((1R)-1-((7-(6-oxa-3-azabicyclo[3.1.1]heptan-3-yl)-4-methylpyrido[3,4-d]pyridazin-1-yl)amino)ethyl)-2-fluorophenyl)-1,1-difluoro-2- methylpropan-2-ol

Example 21-1(R)-3-(1-((4-methyl-7-morpholinopyrido[3,4-d]pyridazin-1-yl)amino)ethyl)-5-(trifluoromethyl)phenol

Step A: To a solution of(R)-1-(3-(benzyloxy)-5-(trifluoromethyl)phenyl)ethan-1-amine (120 mg,359 μmol, 0.95 eq., HCl) and4-(1-chloro-4-methylpyrido[3,4-d]pyridazin-7-yl)morpholine (100 mg, 378μmol, 1.00 eq.) in dimethyl sulfoxide (3.00 mL) was added potassiumfluoride (87.8 mg, 1.51 mmol, 35.4 μL, 4.00 eq.) under a nitrogenatmosphere, and the solution was stirred at 130° C. for 12 hours. Thereaction mixture was diluted with water (15.0 mL), extracted with ethylacetate (10.0 mL×3), washed with brine (5.00 mL×3), dried over anhydroussodium sulfate, filtered, and concentrated under reduced pressure togive a residue. The residue was purified by prep-TLC(dichloromethane/methanol=10/1) to give(R)—N-(1-(3-(benzyloxy)-5-(trifluoromethyl)phenyl)ethyl)-4-methyl-7-morpholinopyrido[3,4-d]pyridazin-1-amine(65.0 mg, 121 μmol, 32.1% yield, 97.8% purity) as a yellow solid. LCMS[M+1]⁺: 524.3.

A solution of(R)—N-(1-(3-(benzyloxy)-5-(trifluoromethyl)phenyl)ethyl)-4-methyl-7-morpholinopyrido[3,4-d]pyridazin-1-amine(65.0 mg, 124 μmol, 1.00 eq.), Pd/C (20.0 mg, 10% purity) and palladiumhydroxide (20.0 mg) in methanol (5.00 mL) at 25° C. under a hydrogenatmosphere (15 Psi) at 20° C. for 30 minutes. The solution was filteredand concentrated under reduced pressure to give a residue. The residuewas purified by prep-HPLC [(Phenomenex luna C18 150×25 mm×10 um; mobilephase: phase A: water (0.225% formic acid), phase B: MeCN; B %:12%-42%)] to give(R)-3-(1-((4-methyl-7-morpholinopyrido[3,4-d]pyridazin-1-yl)amino)ethyl)-5-(trifluoromethyl)phenol(12.2 mg, 25.2 μmol, 20.3% yield, 99.4% purity, formate salt) as ayellow solid. LCMS [M+1]⁺: 434.2.

¹H NMR (400 MHz, DMSO-d₆) δ=10.06-9.94 (m, 1H), 9.02 (s, 1H), 8.13 (s,1H), 7.46 (d, J=0.8 Hz, 1H), 7.40 (s, 1H), 7.16 (s, 1H), 7.06 (s, 1H),6.85 (s, 1H), 5.39 (m, 1H), 3.78-3.77 (m, 4H), 3.70-3.69 (m, 4H), 2.58(s, 3H), 1.56 (d, J=6.8 Hz, 3H).

SFC conditions: “Column: Chiralcel OD-3 50×4.6 mm I.D., 3 um Mobilephase: Phase A for CO₂, and Phase B for methnol (0.05% DEA); gradientelution:methnol (0.05% DEA) in CO₂ from 5% to 40% flow rate: 3 mL/min;Detector: PDA; Column Temp: 35° C.; Back Pressure: 100 Bar”.

Example 21-2

Step A: To a solution of 6-bromo-4-chloro-1-methylphthalazine (279 mg,1.09 mmol, 1.20 eq.) and(R)-1-(3-(benzyloxy)-5-(trifluoromethyl)phenyl)ethan-1-amine (300 mg,0.90 mmol, 1.00 eq., HCl) in dimethyl sulfoxide (5.00 mL) was addedpotassium fluoride (263 mg, 4.52 mmol, 106 μL, 5.00 eq.), and themixture was stirred at 130° C. for 12 hours. The mixture was dilutedwith water (20.0 mL) and extracted with ethyl acetate (20.0 mL×3). Thecombined organic layers were washed with brine (20.0 mL×2), dried oversodium sulfate, filtered, and concentrated under reduced pressure togive a residue. The residue was purified by prep-TLC (silica gel plate,petroleum ether:ethyl acetate=1:1, Rf=0.2) to give(R)—N-(1-(3-(benzyloxy)-5-(trifluoromethyl)phenyl)ethyl)-7-bromo-4-methylphthalazin-1-amine(300 mg, 581 μmol, 64.3% yield) as a yellow solid. LCMS [M+1]⁺: 516.0.

Step B: To a solution of(R)—N-(1-(3-(benzyloxy)-5-(trifluoromethyl)phenyl)ethyl)-7-bromo-4-methylphthalazin-1-amine(150 mg, 0.29 mmol, 1.00 eq.), morpholine (50.6 mg, 0.58 mmol, 51.1 μL,2.00 eq.), RuPhos (13.6 mg, 0.03 mmol, 0.10 eq.) and cesium carbonate(284 mg, 872 μmol, 3.00 eq.) in dioxane (10.0 mL) was added Pd₂(dba)₃(26.6 mg, 0.03 mmol, 0.10 eq.), then the reaction was stirred at 100° C.for 12 hours under a nitrogen atmosphere. The reaction was quenched withwater (15.0 mL) and the mixture was extracted with ethyl acetate (15.0mL×3). The combined organic layers were washed with brine (15.0 mL×2),dried over sodium sulfate, filtered, and concentrated under reducedpressure to give a residue. The residue was purified by prep-TLC (silicagel plate, dichloromethane:methyl alcohol=10:1, Rf=0.3) to give(R)—N-(1-(3-(benzyloxy)-5-(trifluoromethyl)phenyl)ethyl)-4-methyl-7-morpholinophthalazin-1-amine(120 mg, 230 μmol, 79.1% yield) as a yellow oil. LCMS [M+1]⁺: 523.3.

¹H NMR (400 MHz, DMSO-d₆) δ=7.98 (d, J=9.2 Hz, 1H), 7.83 (d, J=8.8 Hz,1H), 7.70 (dd, J=2.8, 9.2 Hz, 1H), 7.61-7.57 (m, 2H), 7.35-7.29 (m, 5H),7.17-7.13 (m, 2H), 5.50 (t, J=6.8 Hz, 1H), 5.14 (s, 2H), 3.85 (m, 4H),3.44-3.39 (m, 4H), 2.55 (s, 3H), 1.59 (d, J=6.8 Hz, 3H).

Step C: To a solution of (R)—N-(1-(3-(benzyloxy)-5-(trifluoromethyl)phenyl)ethyl)-4-methyl-7-morpholinophthalazin-1-amine(120 mg, 0.03 mmol, 1.00 eq.) in methanol (10.0 mL) were added Pd/C(80.0 mg, 0.03 mmol, 10% purity, 1.00 eq.) and palladium hydroxide (80.0mg, 0.03 mmol, 1.00 eq.), then the reaction was stirred at 40° C. for 1hour under a hydrogen atmosphere (15 psi). The reaction was filtered andconcentrated under reduced pressure to give a residue. The residue waspurified by prep-HPLC [(column: Waters Xbridge 150×25 mm 10 um; mobilephase: phase A: water (10 mM NH₄HCO₃), phase B: MeCN; B %: 28%-58%)] togive(R)-3-(1-((4-methyl-7-morpholinophthalazin-1-yl)amino)ethyl)-5-(trifluoromethyl)phenol(34.0 mg, 78.6 μmol, 34.2% yield) as a yellow solid. LCMS [M+1]⁺: 433.3.

¹H NMR (400 MHz, DMSO-d₆): 5=9.95 (s, 1H), 7.78-7.76 (m, 1H), 7.60-7.58(m, 2H), 7.29 (d, J=7.2 Hz, 1H), 7.18 (s, 1H), 7.09 (s, 1H), 6.84 (s,1H), 5.48-5.41 (m, 1H), 3.84-3.82 (m, 4H), 3.43-3.40 (m, 4H), 2.55 (s,3H), 1.57 (d, J=7.2 Hz, 3H).

SFC conditions: Chiralcel OD-3 50×4.6 mm I.D., 3 um Mobile phase: PhaseA for CO₂, and Phase B for MeOH (0.05% DEA); Gradient elution: MeOH(0.05% DEA) in CO₂ from 5% to 40% Flow rate: 3 mL/min; Detector: PDA;Column Temp: 35° C.; Back Pressure: 100 Bar.

Example 21-3(R)-3-methyl-5-(1-((4-methyl-7-morpholinopyrido[3,4-b]pyridazin-1-yl)amino)ethyl)benzonitrile

Step A: A mixture of 3-acetyl-5-methylbenzonitrile (0.50 g, 3.14 mmol,1.00 eg.), (R)-2-methylpropane-2-sulfinamide (495 mg, 4.08 mmol, 1.30eq.) and titanium ethoxide (1.43 g, 6.28 mmol, 1.30 mL, 2.00 eg.) intetrahydrofuran (5.00 mL) was degassed and purged with nitrogen for 3times, and then the mixture was stirred at 70° C. for 12 hours under anitrogen atmosphere. The reaction mixture was then quenched by additionwater (10.0 mL) at 25° C., and extracted with ethyl acetate (20.0 mL×3),dried over anhydrous sodium sulfate, filtered, and concentrated underreduced pressure to give a residue. The residue was purified by columnchromatography (SiO₂, petroleum ether/ethyl acetate=10/1 to 1/1) to give(R,E)-N-(1-(3-cyano-5-methylphenyl)ethylidene)-2-methylpropane-2-sulfinamide(730 mg, 2.78 mmol, 88.6% yield) as a yellow oil. LCMS [M+1]⁺: 263.0.

¹H NMR (400 MHz, DMSO-d₆) δ=8.10 (s, 1H), 8.01 (s, 1H), 7.86 (d, J=0.4Hz, 1H), 2.73 (s, 3H), 2.42 (s, 3H), 1.23 (s, 9H).

Step B: To a solution of(R,E)-N-(1-(3-cyano-5-methylphenyl)ethylidene)-2-methylpropane-2-sulfinamide(0.30 g, 1.14 mmol, 1.00 eq.) in tetrahydrofuran (3.00 mL) was addedsodium borohydride (130 mg, 3.43 mmol, 3.00 eq.) at 0° C. The mixturewas stirred at 20° C. for 2 hours. The mixture was quenched withammonium chloride solution (10.0 mL) and concentrated under reducedpressure to give a residue. The residue was diluted with ethyl acetate(60.0 ml) and the organic layer was washed with brine (20.0 mL), driedover anhydrous sodium sulfate, filtered and concentrated under reducedpressure to give a residue. The residue was purified by prep-TLC (SiO₂,petroleum ether/ethyl acetate=1/1) to give(R)—N-(1-(3-cyano-5-methylphenyl)ethyl)-2-methylpropane-2-sulfinamide(280 mg, 1.06 mmol, 92.6% yield) as a yellow oil. LCMS [M+1]⁺: 265.1.

¹H NMR (400 MHz, DMSO-t/6) 5=7.67 (s, 1H), 7.56-7.52 (m, 2H), 5.76 (d,J=7.6 Hz, 1H), 4.45-4.35 (m, 1H), 2.35 (s, 3H), 1.38 (d, J=7.2 Hz, 3H),1.12 (s, 9H).

Step C: A mixture of (R)—N-(1-(3-cyano-5-methyl phenyl)ethyl)-2-methylpropane-2-sulfinamide (250 mg, 946 μmol, 1.00 eq.) in hydrochloricacid/ethyl acetate (4.0 M, 2.60 mL, 11.0 eq.) was stirred at 25° C. for1 hour. The reaction mixture was quenched with saturated sodiumbicarbonate solution (5.00 mL), and extracted with ethyl acetate (10.0mL×3), dried over anhydrous sodium sulfate, filtered, and concentratedunder reduced pressure to give 3-(1-aminoethyl)-5-methylbenzonitrile(130 mg, 811 μmol, 85.8% yield) as a yellow oil.

¹H NMR (400 MHz, DMSO-d₆) δ=7.62 (s, 1H), 7.53 (s, 1H), 7.48 (d, J=0.4Hz, 1H), 4.01 (q, J=6.8 Hz, 1H), 2.34 (s, 3H), 1.24 (d, J=6.8 Hz, 3H).

Step D: A mixture of 3-(1-aminoethyl)-5-methylbenzonitrile (100 mg, 624μmol, 1.00 eq.),4-(1-chloro-4-methylpyrido[3,4-d]pyridazin-7-yl)morpholine (165 mg, 624μmol, 1.00 eq.) and potassium fluoride (109 mg, 1.87 mmol, 3.00 eq.) indimethyl sulfoxide (0.20 mL) was degassed and purged with nitrogen for 3times, and then the mixture was stirred at 130° C. for 12 hours under anitrogen atmosphere. The reaction mixture was quenched by water (10.0mL) at 25° C., and extracted with ethyl acetate (10.0 mL×3), dried overanhydrous sodium sulfate, filtered, and concentrated under reducedpressure to give a residue. The residue was purified by prep-HPLC[column: Waters Xbridge 150×25 mm 10 um; mobile phase: phase A: water(10 mM NH₄HCO₃), phase B: MeCN; B %: 24%-54%] to give3-methyl-5-(1-((4-methyl-7-morpholinopyrido[3,4-d]pyridazin-1-yl)amino)ethyl)benzonitrile(80.0 mg, 206 μmol, 32.9% yield, 99.9% purity) as a yellow solid. Theenantiomers were separated with SFC [column: DAICEL CHIRALPAK AD (250mm×30 mm, 10 urn); mobile phase: phase A: 0.1% NH₄OH in MeOH, phase B:CO₂; B %: 25%].

Example 21-3,(R)-3-methyl-5-(1-((4-methyl-7-morpholinopyrido[3,4-d]pyridazin-1-yl)amino)ethyl)benzonitrile(first eluting isomer)

¹H NMR (400 MHz, CD₃OD) δ=8.97 (s, 1H), 7.56 (s, 2H), 7.34 (s, 1H), 7.27(s, 1H), 5.37 (q, J=6.8 Hz, 1H), 3.85-3.80 (m, 4H), 3.76-3.72 (m, 4H),2.62 (s, 3H), 2.33 (s, 3H), 1.63 (d, 6.8 Hz, 3H)

LCMS [M+1]⁺: 389.2.

SFC conditions: “Column: Chiralpak AD-3 50×4.6 mm I.D., 3 um Mobilephase: Phase A for CO₂, and Phase B for MeOH (0.05% DEA); Gradientelution: MeOH (0.05% DEA) in CO₂ from 5% to 40% Flow rate: 3 mL/min;Detector: PDA; Column Temp: 35° C.; Back Pressure: 100 Bar”

Example 21-4(R)-3-methyl-5-(1-((4-methyl-7-morpholinophthalazin-1-yl)amino)ethyl)benzonitrile

Step A: A mixture of 3-(1-aminoethyl)-5-methylbenzonitrile (100 mg, 624μmol, 1.00 eq.), 6-bromo-4-chloro-1-methylphthalazine (161 mg, 624 μmol,1.00 eq.) and cesium fluoride (284 mg, 1.87 mmol, 69.0 μL, 3.00 eq.) indimethylsulfoxide (0.20 mL) was degassed and purged with nitrogen for 3times, and then the mixture was stirred at 130° C. for 1 hour under anitrogen atmosphere. The reaction mixture was quenched by addition water(10.0 mL) at 25° C., extracted with ethyl acetate (10.0 mL×3), driedover anhydrous sodium sulfate, filtered, and concentrated under reducedpressure to give a residue. The residue was purified by prep-TLC (SiO₂,petroleum ether/ethyl acetate=1:1) to give3-(1-((7-bromo-4-methylphthalazin-1-yl)amino)ethyl)-5-methylbenzonitrile(50.0 mg, 131 μmol, 21.0% yield) as a yellow oil. LCMS [M+1]⁺: 382.9.

A mixture of3-(1-((7-bromo-4-methylphthalazin-1-yl)amino)ethyl)-5-methylbenzonitrile(40.0 mg, 105 μmol, 1.00 eq.), morpholine (36.6 mg, 420 μmol, 36.9 μL,4.00 eq.), cesium carbonate (103 mg, 315 μmol, 3.00 eq.) and RuPhos PdG₃ (87.8 mg, 105 μmol, 1.00 eq.) in dioxane (1.00 mL) was degassed andpurged with nitrogen for 3 times, and then the mixture was stirred at80° C. for 2 hours under a nitrogen atmosphere. The reaction mixture wasquenched by addition water (10.0 mL) at 25° C., extracted with ethylacetate (10.0 mL×3), dried over anhydrous sodium sulfate, filtered, andconcentrated under reduced pressure to give a residue. The residue waspurified by preparative HPLC J column: Waters Xbridge 150×25 mm 10 um;mobile phase: phase A: water (10 mM NH₄HCO₃, phase B: MeCN; B %:25%-55%] to give3-methyl-5-(1-((4-methyl-7-morpholinophthalazin-1-yl)amino)ethyl)benzonitrile(20.0 mg, 51.5 μmol, 49.0% yield, 99.7% purity) as a white solid. Thepure (R)-enantiomer was obtained using SFC (column: DAICEL CHIRALPAK AD(250 mmx 30 mm, 10 um); mobile phase: phase A: NH₄OH in MeOH, phase B:CO₂; B %: 30%] give(R)-3-methyl-5-(1-((4-methyl-7-morpholinophthalazin-1-yl)amino)ethyl)benzonitrile(4.51 mg) as yellow solid. LCMS [M+1]⁺: 388.2.

¹H NMR (400 MHz, CD₃OD) δ=7.88 (d, J=9.2 Hz, 1H), 7.59-7.52 (m, 4H),7.32 (s, 1H), 5.41 (q, J=6.8 Hz, 1H), 3.91-3.84 (m, 4H), 3.46-3.40 (m,4H), 2.61 (s, 3H), 2.32 (s, 3H), 1.64 (d, J=7.2 Hz, 3H).

SFC conditions: Column: Chiralpak AD-3 50×4.6 mm I.D., 3 um Mobilephase: Phase A for CO₂, and Phase B for MeOH (0.05% DEA); Gradientelution: MeOH (0.05% DEA) in CO₂ from 5% to 40% Flow rate: 3 mL/min;Detector: PDA; Column Temp: 35° C.; Back Pressure: 100 Bar.

Example 21-5 and Example 21-67-((R)-4-(dimethylamino)-3,3-difluoropiperidin-1-yl)-4-methyl-N—((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine7-((5)-4-(dimethylamino)-3,3-difluoropiperidin-1-yl)-4-methyl-N—((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine

Step A: To a solution of tert-butyl4-amino-3,3-difluoropiperidine-1-carboxylate (300 mg, 1.27 mmol, 1.00eq.) in methanol (10.0 mL) was added paraformaldehyde (1.00 g, 1.27mmol, 1.00 eq.) and acetic acid (7.63 mg, 127 μmol, 7.26 μL, 0.10 eq.),the reaction was stirred at 50° C. for 30 minutes, then sodiumcyanoborohydride (479 mg, 7.62 mmol, 6.00 eq.) was added to the reactionin one portion. The reaction mixture was stirred at 50° C. for 16 hours,then concentrated under reduced pressure to give a residue. The residuewas diluted with water (50.0 mL) and extracted with ethyl acetate (30.0mL×3). The combined organic layers were washed with brine (50.0 mL×3),dried over sulfate sodium, filtered, and concentrated under reducedpressure to give a residue. The residue was purified by columnchromatography (SiO₂, petroleum ether/ethyl acetate=5/1 to 3/1) to givecompound tert-butyl4-(dimethylamino)-3,3-difluoropiperidine-1-carboxylate (320 mg, 1.21mmol, 95.4% yield) as a white solid. LCMS [M+1]⁺: 265.1.

Step B: To a solution of tert-butyl4-(dimethylamino)-3,3-difluoropiperidine-1-carboxylate (320 mg, 1.21mmol, 1.00 eq.) in acetonitrile (1.00 mL) was added HCl in dioxane (4.00M, 5.33 mL, 17.6 eq.). The reaction mixture was stirred at 0° C. for 30minutes, then concentrated under reduced pressure give compound3,3-difluoro-N,N-dimethylpiperidin-4-amine (190 mg, 1.16 mmol, 95.6%yield) as a white solid which was used in next step directly.

Step C: A mixture of(R)-7-bromo-4-methyl-N-(1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine(220 mg, 519 μmol, 1.00 eq.),3,3-3,3-difluoro-N,N-dimethylpiperidin-4-amine (128 mg, 778 μmol, 1.50eq.), sodium tert-butoxide (199 mg, 2.07 mmol, 4.00 eq.) and RuPhos PdG₃ (43.4 mg, 51.9 μmol, 0.10 eq.) in dioxane (5.00 mL) was degassed andpurged with nitrogen for 3 times, and then the reaction mixture wasstirred at 110° C. for 16 hours under a nitrogen atmosphere. Thereaction mixture was cooled to 25° C., diluted with water (30.0 mL) andextracted with ethyl acetate (30.0 mL×3). The combined organic layerswere washed with brine (40.0 mL×3), dried over sulfate sodium, filtered,and concentrated under reduced pressure to give a residue. The residuewas first purified by prep-TLC (dichloromethane:methanol=10:1) to give awhite solid. LCMS [M+1]+: 508.3.

The compound was further purified and the diastereomers were separatedusing SFC (column: DAICEL CHIRALCEL OD-H (250 mm×30 mm, 5 μm); mobilephase: phase A: 0.1% NEB in H2O, phase B: MeOH; B %: 20%) to give theseparated isomers7-((R)-4-(dimethylamino)-3,3-difluoropiperidin-1-yl)-4-methyl-N—((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amineand7-((S)-4-(dimethylamino)-3,3-difluoropiperidin-1-yl)-4-methyl-N—((R)-1-(2-methyl-3-(trifluoromethyl)phenyl)ethyl)phthalazin-1-amine.

Spectral Data for Example 21-5 (first eluting isomer):

LCMS [M+1]⁺:508.2

¹H NMR (400 MHz, CD₃OD) δ=8.24 (d, J=9.2 Hz, 1H), 8.00 (d, J=2.0 Hz,1H), 7.88 (dd, J=2.4, 9.2 Hz, 1H), 7.78-7.72 (m, 1H), 7.55 (br d, J=7.6Hz, 1H), 7.34-7.25 (m, 1H), 5.62-5.51 (m, 1H), 5.01-4.95 (m, 1H),4.77-4.64 (m, 1H), 4.38-4.20 (m, 1H), 3.78-3.63 (m, 1H), 3.44 (br t,J=12.0 Hz, 1H), 3.10 (s, 6H), 2.80 (s, 3H), 2.65 (s, 3H), 2.62-2.53 (m,1H), 2.27-2.13 (m, 1H), 1.71 (d, J=6.8 Hz, 3H).

Spectral Data for Example 21-6 (second eluting isomer):

LCMS [M+1]⁺:508.2

¹H NMR (400 MHz, CD₃OD) δ=8.24 (d, J=9.2 Hz, 1H), 8.01 (d, J=2.0 Hz,1H), 7.87 (dd, J=2.4, 9.2 Hz, 1H), 7.77 (d, J=7.6 Hz, 1H), 7.55 (d,J=8.0 Hz, 1H), 7.35-7.24 (m, 1H), 5.62-5.52 (m, 1H), 5.01-4.95 (m, 1H),4.76-4.66 (m, 1H), 4.38-4.20 (m, 1H), 3.81-3.62 (m, 1H), 3.44 (br t,J=12.4 Hz, 1H), 3.15 (s, 6H), 2.80 (s, 3H), 2.65 (s, 3H), 2.61-2.52 (m,1H), 2.28-2.13 (m, 1H), 1.72 (d, J=6.8 Hz, 3H).

Example 21-7

Step A: A mixture of 1-(3-iodophenyl)ethan-1-one (4.60 g, 18.7 mmol,1.00 eq.), ethyl 2-bromo-2,2-difluoroacetate (4.17 g, 20.6 mmol, 2.64mL, 1.10 eq.) and copper powder (3.56 g, 56.1 mmol, 398 μL, 3.00 eq.) inDMSO (50.0 mL) was degassed and purged with nitrogen 3 times, and themixture was stirred at 60° C. for 12 hours under a nitrogen atmosphere.The mixture was diluted with ethyl acetate (100 mL). filtered, and thefiltrate was washed with brine (50.0 mL×3), dried, and concentratedunder reduced pressure. The residue was purified by columnchromatography (SiO₂, petroleum ether/ethyl acetate=80/1 to 30/1) togive ethyl 2-(3-acetylphenyl)-2,2-difluoroacetate (3.80 g, 15.7 mmol,83.9% yield) as colorless oil.

¹H NMR (400 MHz, CDCl₃) δ=8.20 (s, 1H), 8.10 (d, J=7.6 Hz, 1H),7.84-7.80 (m, 1H), 7.59 (t, J=7.2 Hz, 1H), 4.37-4.29 (m, 2H), 2.65 (s,3H), 1.32 (t, J=7.2 Hz, 3H).

Step B: To a solution of ethyl 2-(3-acetylphenyl)-2,2-difluoroacetate(2.00 g, 8.26 mmol, 1.00 eq.) and (R)-2-methylpropane-2-sulfinamide(1.30 g, 10.8 mmol, 1.30 eq.) in THF (40.0 mL) was added titanium (IV)butoxide (3.77 g, 16.5 mmol, 3.42 mL, 2.00 eq.) and 1,2-dimethoxyethane(744 mg, 8.26 mmol, 858 μL, 1.00 eq.), and the mixture was stirred at70° C. for 12 hours. The reaction mixture was diluted with ethyl acetate(100 mL) and water (5.00 mL), filtered, and the filtrate wasconcentrated under reduced pressure. The residue was purified by columnchromatography (SiO₂, petroleum ether/ethyl acetate=10/1 to 5/1) to giveethyl(R)-2-(3-(1-((tert-butylsulfinyl)imino)ethyl)phenyl)-2,2-difluoroacetate(2.40 g, 6.95 mmol, 84.2% yield) as yellow oil.

Step C: To a solution of ethyl(R)-2-(3-(1-((tert-butylsulfinyl)imino)ethyl)phenyl)-2,2-difluoroacetate(2.20 g, 6.37 mmol, 1.00 eq.) in methanol (20.0 mL) was added sodiumborohydride (964 mg, 25.5 mmol, 4.00 eq.) at 0° C., and the mixture wasstirred at 28° C. for 1 hour. The mixture was diluted with water (20.0mL) and extracted with ethyl acetate (50.0 mL×3), and the combinedorganic phases were dried and concentrated under reduced pressure. Theresidue was purified by column chromatography (SiO₂, petroleumether/ethyl acetate=2/1 to 1/1) to give(R)—N—((R)-1-(3-(1,1-difluoro-2-hydroxyethyl)phenyl)ethyl)-2-methylpropane-2-sulfinamide(0.90 g, 2.95 mmol, 46.3% yield) as yellow oil and(R)—N—((R)-1-(3-(1,1-difluoro-2-hydroxyethyl)phenyl)ethyl)-2-methylpropane-2-sulfinamide(0.90 g, 2.95 mmol, 46.3% yield) as yellow oil. LCMS [M+1]⁺: 306.1.

Step D: To a solution of(R)—N—((R)-1-(3-(1,1-difluoro-2-hydroxyethyl)phenyl)ethyl)-2-methylpropane-2-sulfinamide(0.90 g, 2.95 mmol, 1.00 eq.) in THF (8.00 mL) and water (2.00 mL) wasadded iodine (224 mg, 884 μmol, 178 μL, 0.30 eq.), and the mixture wasstirred at 50° C. for 1 hour. The reaction mixture was then diluted withsaturated sodium sulfite aqueous solution (10.0 ml) and sodiumbicarbonate aqueous solution (10.0 mL), and the resulting mixture wasextracted with dichloromethane/methanol (10:1, 10.0 mL×3). The combinedorganic phases were dried and concentrated under reduced pressure togive (R)-2-(3-(1-aminoethyl)phenyl)-2,2-difluoroethane-1-ol (450 mg,crude) as yellow oil.

Step E: A mixture of4-(1-chloro-4-methylpyrido[3,4-d]pyridazin-7-yl)morpholine (200 mg, 756μmol, 1.00 eq.), (R)-2-(3-(1-aminoethyl)phenyl)-2,2-difluoroethane-1-ol(152 mg, 756 μmol, 1.00 eq.), BrettPhos Pd G₃ (68.5 mg, 75.6 μmol, 0.10eq.) and sodium tert-butoxide (218 mg, 2.27 mmol, 3.00 eq.) in dioxane(3.00 mL) was degassed and purged with nitrogen 3 times, and then themixture was stirred at 100° C. for 1 hour under a nitrogen atmosphere.The reaction mixture was filtered and concentrated under reducedpressure. The residue was purified by prep-HPLC [column: Phenomenex LunaC18 150×25 mm×10 um; mobile phase: phase A: water (0.225% formic acid,phase B: acetonitrile; B %: 9%-39%) to give(R)-2,2-difluoro-2-(3-(1-((4-methyl-7-morpholinopyrido[3,4-d]pyridazin-1-yl)amino)ethyl)phenyl)ethan-1-ol(73.0 mg, 170 μmol, 22.5% yield, 99.9% purity) as a yellow solid. LCMS[M+1]⁺: 430.1.

¹H NMR (400 MHz, CD₃OD) δ=9.11 (s, 1H), 8.48 (s, 1H), 7.62 (s, 1H), 7.56(br d, J=6.4 Hz, 1H), 7.46-7.35 (m, 3H), 5.44-5.34 (m, 1H), 3.95-3.81(m, 10H), 2.71 (s, 3H), 1.69 (d, 6.8 Hz, 3H).

Example 21-8

Step A: The sodium nitrite (20.1 mg, 292 μmol, 1.30 eq.) in water (0.60mL) was added dropwise to a mixture of(R)—N-(1-(5-amino-2-methyl-3-(trifluoromethyl)phenyl)ethyl)-4-methyl-7-morpholinophthalazin-1-amine(100 mg, 224 μmol, 1.00 eq.) and tetrafluoroboric acid (253 mg, 1.15mmol, 179 μL, 40.0% purity, 5.13 eq.) in water (3.00 mL) at 0° C., themixture was stirred at 0° C. for 30 minutes. The reaction mixture wasfiltered and the after cake was concentrated under reduced pressure togive(R)-4-methyl-3-(1-((4-methyl-7-morpholinophthalazin-1-yl)amino)ethyl)-5-(trifluoromethyl)benzenediazoniumtetrafluoroborate (100 mg, crude) as a yellow solid. LCMS [M−28]⁺:429.0.

Step B: A solution of(R)-4-methyl-3-(1-((4-methyl-7-morpholinophthalazin-1-yl)amino)ethyl)-5-(trifluoromethyl)benzenediazoniumtetrafluoroborate (100 mg, 184 μmol, 1.00 eq.) in toluene (1.00 mL) washeated to 110° C., the mixture was stirred at 110° C. for 3 hours. Thereaction mixture was concentrated under reduced pressure to give aresidue. The residue was purified by prep-HPLC [column: Phenomenex lunaC18 80×40 mm×3 um; mobile phase: phase A: water(0.04% HCl), phase B:acetonitrile; B %: 28%-52%] to give(R)—N-(1-(5-fluoro-2-methyl-3-(trifluoromethyl)phenyl)ethyl)-4-methyl-7-morpholinophthalazin-1-amine(13.1 mg, 28.9 μmol, 15.8% yield, 99.3% purity, hydrochloride salt) as ayellow solid. LCMS [M+1]⁺: 449.1.

¹H NMR (400 MHz, DMSO-d₆) δ=14.75 (br s, 1H), 8.58-8.41 (m, 1H),8.22-8.15 (m, 1H), 7.81 (s, 1H), 7.79-7.74 (m, 1H), 7.62-7.56 (m, 1H),7.48-7.43 (m, 1H), 5.50-5.37 (m, 1H), 3.85-3.80 (m, 4H), 3.72-3.65 (m,4H), 2.73 (s, 3H), 2.54 (s, 3H), 1.64-1.58 (m, 3H).

SFC conditions: Chiralcel OD-3 3 μm, 0.46 cm id×5 cm L; Mobile phase: Afor SFC CO₂ and B for MeOH (0.05% isopropylamine); Gradient elution: Bin A from 10% to 40% in 3 minutes; Flowrate: 4.0 mL/min; Column Temp:35° C.; Back Pressure: 100 Bar.

Example 21-93-((R)-1-((5-fluoro-7-((R)-hexahydro-2H,6H-pyrasine[1,2-c][1,3]oxazin-2-yl)-4-methylphthalazin-1-yl)amino)ethyl)-2-methylbenzonitrile

Step A: To a solution of 2-amino-5-bromo-3-fluorobenzoic acid (2.00 g,8.55 mmol, 1.00 eq.) in hydrochloric acid (4.0 M, 21.4 mL, 10.0 eq.) andwater (10.0 mL) was added sodium nitrite (708 mg, 10.3 mmol, 1.20 eq.)at 0° C., then the mixture was stirred at the same temperature for 30minutes. After this time a solution of potassium iodide (2.13 g, 12.8mmol, 1.50 eq.) was added dropwise, and then the mixture was heated to90° C. and stirred for 30 minutes. The mixture was the cooled, and thepH adjusted to pH=9 with potassium carbonate and then filtered. Thefiltrate was adjusted to pH=4 with HCl (4.0 M in water), filtered, andthe precipitate was dried under vacuum to give5-bromo-3-fluoro-2-iodobenzoic acid (2.40 g, 6.96 mmol, 81.4% yield) asa yellow solid.

¹H NMR (400 MHz, DMSO-d₆) δ=14.06-13.55 (m, 1H), 7.79-7.72 (m, 1H),7.69-7.64 (m, 1H).

Step B: To a solution of 5-bromo-3-fluoro-2-iodobenzoic acid (2.40 g,6.96 mmol, 1.00 eq.) in toluene (24.0 mL) and methanol (8.00 mL) wasadded trimethylsilyldiazomethane (2.0 M, 6.96 mL, 2.00 eq.) dropwise at0° C., and the mixture was stirred at 20° C. for 30 minutes. Thereaction mixture was then concentrated under reduced pressure, and theresidue was purified by column chromatography (SiO₂, petroleumether/ethyl acetate=1/0 to 10/1) to give methyl5-bromo-3-fluoro-2-iodobenzoate (2.47 g, 6.88 mmol, 98.9% yield) as ayellow solid.

¹H NMR (400 MHz, CDCl₃) δ=7.76-7.69 (m, 1H), 7.40-7.33 (m, 1H), 3.96 (s,3H).

Step C: A mixture of methyl 5-bromo-3-fluoro-2-iodobenzoate (2.47 g,6.88 mmol, 1.00 eq.), tributyl(1-ethoxyvinyl)tin (2.73 g, 7.57 mmol,2.55 mL, 1.10 eq.) and Pd(PPh₃)₂Cl₂ (483 mg, 688 μmol, 0.10 eq.) indioxane (30.0 mL) was degassed and purged with nitrogen (3 times), andthen the mixture was stirred at 80° C. for 12 hours under a nitrogenatmosphere. The mixture was then poured into a saturated solution ofpotassium fluoride (in water, 50.0 mL) and stirred for 30 minutes. Theaqueous phase was extracted with ethyl acetate (100 mL×3), and thecombined organic phases were washed with brine (50.0 mL×3), dried overanhydrous sodium sulfate, filtered, and concentrated under reducedpressure. The residue was purified by column chromatography (SiO₂,petroleum ether/ethyl acetate=100/1 to 20/1) to give methyl5-bromo-2-(1-ethoxyvinyl)-3-fluorobenzoate (1.80 g, 5.94 mmol, 86.3%yield) as yellow oil.

¹H NMR (400 MHz, CDCl₃) δ=7.69-7.65 (m, 1H), 7.44-7.37 (m, 1H), 4.50 (d,J=2.4 Hz, 1H), 4.38-4.34 (m, 1H), 3.90-3.85 (m, 5H), 1.32 (t, J=6.8 Hz,3H).

Step D: To a solution of methyl5-bromo-2-(1-ethoxyvinyl)-3-fluorobenzoate (1.80 g, 5.94 mmol, 1.00 eq.)in THF (20.0 mL) was added hydrochloric acid (2.0 M, 8.91 mL, 3.00 eq.),and the mixture was stirred at 20° C. for 1 hour. The pH of the mixturewas then adjusted to pH=7 with saturated sodium bicarbonate aqueoussolution, and the solution was extracted with ethyl acetate (30.0 mL×2).The combined organic phases were dried over anhydrous sodium sulfate andconcentrated under reduced pressure. The residue was purified by columnchromatography (SiO₂, petroleum ether/ethyl acetate=50/1 to 30/1) togive methyl 2-acetyl-5-bromo-3-fluorobenzoate (1.40 g, 5.09 mmol, 85.7%yield) as yellow oil.

¹H NMR (400 MHz, CDCl₃) δ=7.91 (s, 1H), 7.54-7.41 (m, 1H), 3.91 (s, 3H),2.59 (s, 3H).

Step E: To a solution of methyl 2-acetyl-5-bromo-3-fluorobenzoate (1.20g, 4.36 mmol, 1.00 eq.) in ethanol (10.0 mL) was added hydrazine hydrate(334 mg, 6.54 mmol, 325 μL, 98% purity, 1.50 eq.), and the mixture wasstirred at 60° C. for 1 hour. The mixture was then cooled to 20° C.,filtered, and the precipitate was dried under vacuum to give7-bromo-5-fluoro-4-methylphthalazin-1-ol (580 mg, 2.26 mmol, 51.7%yield) as a white solid.

¹H NMR (400 MHz, DMSO-d₆) δ=12.7 (br s, 1H), 8.17 (d, J=1.6 Hz, 1H),8.15-8.08 (m, 1H), 2.56 (d, J=6.8 Hz, 3H).

Step F: To a solution of 7-bromo-5-fluoro-4-methylphthalazin-1-ol (300mg, 1.17 mmol, 1.00 eq.) in phosphorus oxychloride (6.00 mL) was addedN,N-diisopropylethylamine (453 mg, 3.50 mmol, 10.0 μL, 3.00 eq.), andthe mixture was stirred at 110 C for 2 hours. The mixture was thenquenched by sodium bicarbonate aqueous solution and extracted with ethylacetate (10.0 mL×3). The combined organic phases were dried overanhydrous sodium sulfate, concentrated under reduced pressure, and theresidue was purified by column chromatography (SiO₂, petroleumether/ethyl acetate=5/1) to give7-bromo-1-chloro-5-fluoro-4-methylphthalazine (150 mg, 544 μmol, 46.7%yield) as an orange solid. LCMS [M+1]⁺: 276.8.

Step G: To a solution of 7-bromo-1-chloro-5-fluoro-4-methylphthalazine(150 mg, 544 μmol, 1.00 eq.) in DMSO (1.00 mL) was added cesium fluoride(124 mg, 817 μmol, 30.1 μL, 1.50 eq.) and(R)-3-(1-aminoethyl)-2-methylbenzonitrile (87.2 mg, 544 μmol, 1.00 eq.),and the mixture was stirred at 130° C. for 30 minutes. The mixture wasthen cooled to 25° C., diluted with ethyl acetate (20.0 mL), washed withbrine (10.0 mL×3), and the separated organic phases were dried andconcentrated under reduced pressure. The residue was purified by columnchromatography (SiO₂, petroleum ether/ethyl acetate=5/1 to 2/1) to give(R)-3-(1-((7-bromo-5-fluoro-4-methylphthalazin-1-yl)amino)ethyl)-2-methylbenzonitrile(160 mg, 401 μmol, 73.6% yield) as a yellow solid. LCMS [M+1]⁺: 399.1.

Step H: A mixture of(R)-3-(1-((7-bromo-5-fluoro-4-methylphthalazin-1-yl)amino)ethyl)-2-methylbenzonitrile(15.0 mg, 37.6 μmol, 1.00 eq.),(R)-hexahydro-2H,6H-pyrazino[1,2-c][1,3]oxazine (10.5 mg, 48.8 μmol,1.30 eq., 2 HCl), cesium carbonate (61.2 mg, 188 μmol, 5.00 eq.), RuPhos(3.51 mg, 7.51 μmol, 0.20 eq.) and Pd₂(dba)₃ (3.44 mg, 3.76 μmol, 0.10eq.) in dioxane (1.00 mL) was degassed and purged with nitrogen (3times), and then the mixture was stirred at 105° C. for 2 hours under anitrogen atmosphere. The mixture was cooled to 25° C., filtered, andconcentrated under reduced pressure. The residue was then purified byprep-HPLC [column: Phenomenex luna C18 150×25 mm×10 um; mobile phase:phase A: water (0.225% formic acid), phase B: acetonitrile; B %: 2%-32%]to give3-((R)-1-((5-fluoro-7-((R)-hexahydro-2H,6H-pyrazino[1,2-c][1,3]oxazin-2-yl)-4-methylphthalazin-1-yl)amino)ethyl)-2-methylbenzonitrile(7.70 mg, 15.2 μmol, 40.5% yield, 99.9% purity, formate salt) as anoff-white solid. LCMS [M+1]⁺: 461.2.

¹H NMR (400 MHz, CD₃OD) δ=8.52 (br s, 1H), 7.70 (d, J=7.6 Hz, 1H), 7.50(d, J=7.2 Hz, 1H), 7.41 (d, J=2.0 Hz, 1H), 7.39-7.33 (m, 1H), 7.25 (t,J=8.0 Hz, 1H), 5.59-5.51 (m, 1H), 4.11 (br d, J=13.2 Hz, 1H), 3.96 (brd, J=12.4 Hz, 1H), 3.92-3.84 (m, 2H), 3.77-3.68 (m, 1H), 3.39-3.33 (m,1H), 3.21-3.11 (m, 1H), 2.97 (br d, J=11.6 Hz, 1H), 2.80 (br d, J=11.6Hz, 1H), 2.75-2.63 (m, 7H), 2.51-2.35 (m, 3H), 1.62 (d, J=7.2 Hz, 3H).

Example 21-10(R)-3-(1-((5-fluoro-7-(3-hydroxy-3-methylazetidin-1-yl)-4-methylphthalazin-1-yl)amino)ethyl)-2-methylbenzonitrile

A mixture of(R)-3-(1-((7-bromo-5-fluoro-4-methylphthalazin-1-yl)amino)ethyl)-2-methylbenzonitrile(60.0 mg, 150 μmol, 1.00 eq.), 3-methylazetidin-3-ol (27.9 mg, 225 μmol,1.50 eq., HCl), cesium carbonate (245 mg, 751 μmol, 5.00 eq.), RuPhos(14.0 mg, 30.1 μmol, 0.20 eq.) and Pd₂(dba)₃ (13.8 mg, 15.0 μmol, 0.10eq.) in dioxane (1.00 mL) was degassed and purged with nitrogen (3times), and the mixture was stirred at 100° C. for 2 hours under anitrogen atmosphere. The n mixture was filtered and concentrated underreduced pressure, and the residue was purified by prep-HPLC [column:Phenomenex luna C18 150×25 mm×10 um; mobile phase: phase A: water(0.225%formic acid, phase B: acetonitrile; B %: 10%-40%] to give(R)-3-(1-((5-fluoro-7-(3-hydroxy-3-methylazetidin-1-yl)-4-methylphthalazin-1-yl)amino)ethyl)-2-methylbenzonitrile(39.0 mg, 86.0 μmol, 57.3% yield, 99.6% purity, formate salt) as ayellow solid. LCMS [M+1]⁺: 406.1.

¹H NMR (400 MHz, CD₃OD) δ=8.51 (s, 1H), 7.70 (d, J=7.6 Hz, 1H),7.55-7.47 (m, 1H), 7.27 (t, J=8.0 Hz, 1H), 7.07 (d, J=2.0 Hz, 1H),6.87-6.77 (m, 1H), 5.54-5.37 (m, 1H), 4.14-4.07 (m, 2H), 4.07-4.00 (m,2H), 2.79-2.65 (m, 6H), 1.68-1.55 (m, 6H).

Example 21-11

Step A: To a solution of 3-bromo-4-fluoro-5-(trifluoromethyl)aniline(4.00 g, 15.5 mmol, 1.00 eq.), tributyl(1-ethoxyvinyl)tin (5.60 g, 15.5mmol, 5.23 mL, 1.00 eq.), and PdCl₂(PPh)₃ (326 mg, 0.47 mmol, 0.03 eq.)in 1,4-dioxane (10.0 mL) was stirred at 80° C. for 10 hours under anitrogen atmosphere. The r mixture was cooled to 25° C., poured intosaturated potassium fluoride aqueous solution (200 mL) and stirred for30 minutes to give a suspension, and the suspension was filtered, thenthe filtrate was solution was extracted with ethyl acetate (200 mL×3).The combined organic layers were washed with brine (200 mL), dried oversodium sulfate, filtered, and concentrated under reduced pressure togive a crude product3-(1-ethoxyvinyl)-4-fluoro-5-(trifluoromethyl)aniline (6.00 g, 24.1mmol, 1.00 eq., crude) which was used into the next step without furtherpurification.

Step B: To a solution of3-(1-ethoxyvinyl)-4-fluoro-5-(trifluoromethyl)aniline (6.00 g, 24.1mmol, 1.00 eq., crude) in tetrahydrofuran (20.0 mL) was addedhydrochloric acid (3.00 M, 8.03 mL, 1.00 eq.) under a nitrogenatmosphere, and the mixture was stirred at 20° C. for 1 hour. Themixture was poured into water (40.0 mL), and then extracted with ethylacetate (40.0 mL×3). The combined organic layers were washed with brine(40.0 mL), dried over sodium sulfate, filtered, and concentrated underreduced pressure. The residue was purified by column chromatography(silica gel, petroleum ether/ethyl acetate=50/1 to 3/1) to give1-(5-amino-2-fluoro-3-(trifluoromethyl)phenyl)ethan-1-one (2.00 g, 9.04mmol) as a yellow solid.

¹H NMR (400 MHz, DMSO-d₆) δ=7.18 (dd, J=3.0, 5.6 Hz, 1H), 7.08 (dd,J=3.2, 5.6 Hz, 1H), 5.67 (s, 2H), 2.54 (d, J=4.4 Hz, 3H).

Step C: To a solution of1-(5-amino-2-fluoro-3-(trifluoromethyl)phenyl)ethan-1-one (2.00 g, 9.04mmol, 1.00 eq.) and (R)-2-methylpropane-2-sulfinamide (1.42 g, 11.8mmol, 1.30 eq.) in tetrahydrofuran (20.0 mL) was added titanium (IV)isopropoxide (5.14 g, 18.1 mmol, 5.34 mL, 2.00 eq.) and1-methoxy-2-(2-methoxyethoxy)ethane (4.69 g, 34.9 mmol, 5.00 mL, 3.86eq.), and the mixture was stirred at 70° C. for 12 hours a undernitrogen atmosphere. The mixture was then concentrated under reducedpressure and the residue was purified by column chromatography (silicagel, petroleum ether/ethyl acetate=30/1 to 1/1) to give(R)—N-(1-(5-amino-2-fluoro-3-(trifluoromethyl)phenyl)ethylidene)-2-methylpropane-2-sulfinamide(500 mg, 1.54 mmol, 17.1% yield) as a yellow oil.

¹H NMR (400 MHz, CDCl₃) δ=7.07 (br s, 1H), 6.95 (br s, 1H), 3.83 (br s,2H), 2.74 (br d, J=2.4 Hz, 3H), 1.31 (s, 9H).

Step D: To a solution of(R)—N-(1-(5-amino-2-fluoro-3-(trifluoromethyl)phenyl)ethylidene)-2-methylpropane-2-sulfinamide(1.10 g, 3.39 mmol, 1.00 eq.) in tetrahydrofuran (15.0 mL) was addedsodium borohydride (385 mg, 10.2 mmol, 3.00 eq) portionwise at 0° C.,under a nitrogen atmosphere. The mixture was stirred at 0° C. for 1hour, then slowly diluted with saturated ammonium chloride aqueoussolution (40.0 mL), and the resulting mixed solution extracted withethyl acetate (30.0 mL×3). The combined organic layers were washed withbrine (30.0 mL), dried over sodium sulfate, filtered, and concentratedunder reduced pressure. The residue was purified by columnchromatography (silica gel, petroleum ether/ethyl acetate=30/1 to 1/1)to give(R)—N-(1-(5-amino-2-fluoro-3-(trifluoromethyl)phenyl)ethyl)-2-methylpropane-2-sulfinamide(600 mg, 1.84 mmol, 54.2% yield) as a yellow oil. LCMS [M+1]⁺: 327.0.

¹H NMR (400 MHz, CDCl₃) δ=6.97-6.83 (m, 1H), 6.82-6.76 (m, 1H),4.83-4.69 (m, 1H), 3.71-3.44 (m, 2H), 1.59-1.50 (m, 3H), 1.25-1.19 (m,9H). (the ratio of diastereoisomers was 2:1).

Step E: To a solution of(R)—N-(1-(5-amino-2-fluoro-3-(trifluoromethyl)phenyl)ethyl)-2-methylpropane-2-sulfinamide(600 mg, 1.84 mmol, 1.00 eq.) in dichloromethane (5.00 mL) was added HCl(4.00 M in dioxane, 5.00 mL, 10.9 eq.) dropwise, then the reactionmixture was stirred at 20° C. for 1 hour. The reaction mixture wasconcentrated under reduced pressure, and the pH of the residue wasadjusted to pH=8 by slow addition saturated sodium bicarbonate aqueoussolution. The aqueous solution was extracted with DCM:methanol (10:1,20.0 mL×5), and the combined organic phases were washed with brine (10.0mL), dried over sodium sulfate, filtered and concentrated under reducedpressure to give 3-(1-aminoethyl)-4-fluoro-5-(trifluoromethyl)aniline(350 mg, 1.58 mmol, 85.7% yield) as a yellow solid which was useddirectly without further purification.

Step F: To a solution of3-(1-aminoethyl)-4-fluoro-5-(trifluoromethyl)aniline (140 mg, 630 μmol,1.00 eq.), 6-bromo-4-chloro-1-methylphthalazine (162 mg, 0.63 mmol, 1.00eq.) and potassium fluoride (183 mg, 3.15 mmol, 73.8 μL, 5.00 eq.) inDMSO (3.00 mL) was stirred at 130° C. for 1 hour under a nitrogenatmosphere. The mixture was poured into water (20.0 mL), and theresulting aqueous solution was extracted with ethyl acetate (20.0 mL×3).The combined organic layers were washed with brine (20.0 mL), dried oversodium sulfate, filtered, and concentrated under reduced pressure. Theresidue was purified by prep-HPLC [column: Welch Xtimate C18 150×25 mm×5um; mobile phase: phase A: water (0.05% HCl), phase B: acetonitrile; B%: 14%-44%] to giveN-(1-(5-amino-2-fluoro-3-(trifluoromethyl)phenyl)ethyl)-7-bromo-4-methylphthalazin-1-amine(10.0 mg, 18.1 μmol, 2.86% yield, 80.0% purity) as a white solid. LCMS[M+1]⁺: 443.1.

The racemicA-(1-(5-amino-2-fluoro-3-(trifluoromethyl)phenyl)ethyl)-7-bromo-4-methylphthalazin-1-amine(100 mg, 226 μmol, 1.00 eq.) was then purified by SFC [column: DAICELCHIRALPAK AS (250 mm×30 mm, 10 um); mobile phase: phase A: (0.1% NH₄OH)in MeOH, phase B: CO₂; B %: 25%-25%] to give(R)—N-(1-(5-amino-2-fluoro-3-(trifluoromethyl)phenyl)ethyl)-7-bromo-4-methylphthalazin-1-amineas the first eluting isomer (20.0 mg, 45.1 μmol, 20.0% yield) as a whitesolid.

Step G: To a solution of(R)—N-(1-(5-amino-2-fluoro-3-(trifluoromethyl)phenyl)ethyl)-7-bromo-4-methylphthalazin-1-amine(20.0 mg, 45.1 μmol, 1.00 eq.), di-Zc N-butyl dicarbonate (11.8 mg, 54.2μmol, 12.4 μL, 1.20 eq.) and N,N-dimethylpyridin-4-amine (5.51 mg, 45.1μmol, 1.00 eq.) in dichloromethane (1.00 mL) was stirred at 20° C. for 1hour. The mixture was poured into water (20.0 mL), and then extractedwith ethyl acetate (20.0 mL G), and the combined organic layers werewashed with brine (20.0 mL), dried over sodium sulfate, filtered, andconcentrated under reduced pressure. The residue was purified byprep-TLC (silica gel, dichloromethane/methyl alcohol=20/1) to givetert-butyl(R)-(3-(1-((7-bromo-4-methylphthalazin-1-yl)amino)ethyl)-4-fluoro-5-(trifluoromethyl)phenyl)(tert-butoxycarbonyl)carbamate(15.0 mg, 23.3 μmol, 51.7% yield) as a gray solid. LCMS [M+3]⁺: 644.9.

Step H: To a solution of tert-butyl(R)-(3-(1-((7-bromo-4-methylphthalazin-1-yl)amino)ethyl)-4-fluoro-5-(trifluoromethyl)phenyl)(tert-butoxycarbonyl)carbamate(15.0 mg, 23.3 μmol, 1.00 eq.), 3-methylazetidin-3-ol (7.46 mg, 46.6μmol, 2.00 eq., HCl salt), RuPhos (2.18 mg, 4.66 μmol, 0.20 eq.),Pd₂(dba)₃ (2.13 mg, 2.33 μmol, 0.10 eq.) and cesium carbonate (38.0 mg,0.12 mmol, 5.00 eq.) in 1,4-dioxane (2.00 mL) was stirred at 100° C. for12 hours under a nitrogen atmosphere. The mixture was cooled to 25° C.,poured into water (10.0 mL), and the resulting aqueous solution wasextracted with ethyl acetate (10.0 mL×3). The combined organic layerswere washed with brine (10.0 mL), dried over sodium sulfate, filtered,and concentrated under reduced pressure. The residue was purified byprep-TLC (silicon dioxide, dichloromethane:methyl alcohol=10:1) to givetert-butyl(R)-(4-fluoro-3-(1-((7-(3-hydroxy-3-methylazetidin-1-yl)-4-methylphthalazin-1-yl)amino)ethyl)-5-(trifluoromethyl)phenyl)carbamate(10.0 mg, 15.3 μmol, 66.0% yield) as a white solid. LCMS [M+1]⁺: 550.1.

To a solution of tert-butyl (R)-(4-fluoro-3-(1-((7-(3-hydroxy-3-methylazetidin-1-yl)-4-methylphthalazin-1-yl)amino)ethyl)-5-(trifluoromethyl)phenyl)carbamate(10.0 mg, 15.4 μmol, 1.00 eq.) in dichloromethane (1.00 mL) was addedTFA (308 mg, 2.70 mmol, 0.20 mL, 175 eq.) dropwise at 20° C., and thereaction mixture was stirred at 20° C. for 1 hour. The mixture was thenconcentrated under reduced pressure, and the residue was purified byprep-HPLC [column: 3_Phenomenex Luna C18 75×30 mm×3 um; mobile phase:phase A: water(10 mM NH₄HCO₃), phase B: acetonitrile; B %: 20%-50%] togive(R)-1-(4-((1-(5-amino-2-fluoro-3-(trifluoromethyl)phenyl)ethyl)amino)-1-methylphthalazin-6-yl)-3-methylazetidin-3-ol(1.12 mg, 2.41 μmol, 15.6% yield, 96.6% purity) as an off-white solid.LCMS [M+1]⁺: 450.4.

¹H NMR (400 MHz, CD₃OD) δ=7.80 (d, J=8.8 Hz, 1H), 7.10 (d, J=2.0 Hz,1H), 6.97 (dd, J=8.8, 2.0 Hz, 1H), 6.83-6.80 (m, 1H), 6.67-6.64 (m, 1H),5.51-5.45 (m, 1H), 3.99-3.95 (m, 2H), 3.89-3.84 (m, 2H), 2.51 (s, 3H),1.55 (d, J=7.2 Hz, 3H), 1.51 (s, 3H).

SFC: Column: Chiralcel OD-3 50×4.6 mm I.D., 3 um Mobile phase: Phase Afor CO₂, and Phase B for MeOH (0.05% diethylamine); Gradient elution:MeOH (0.05% diethylamine) in CO₂ from 5% to 40%; Flow rate: 3 mL/min;Detector: PDA; Column Temp: 35° C.; Back Pressure: 100 Bar.

Example A

This Example illustrates that exemplary compounds of the presentinvention bind to SOS1 and prevent a labeled tracer ligand fromoccupying the SOS1 binding site.

The ability of a compound of Formula (I) to bind to SOS1 was measuredusing a HTRF displacement assay. A recombinant human SOS1 polypeptide(corresponding to amino acids 564-1049, expressed in E. Coli withN-terminal StrepII-TEV, C-terminal His-tag. MW=60.59 kDa) was incubatedwith an exemplary compound of Formula (I) (in a DMSO stock solution) inbuffer (25 mM HEPES pH 7.5, 25 mM NaCl, 1 mM DTT, 0.01% Brij 35, 0.02%BSA, 0.1% DMSO). After a 15-minute incubation at room temperature, asolution comprised of a custom-made Cy5 labelled tracer and MAbAnti-6HIS Tb cryptate Gold (Cisbio 61HI2TLA) in buffer was added to thesolution containing the SOS1 polypeptide and exemplary compound ofFormula (I). After a 1-hour incubation at room temperature, the HTRFsignal was measured using Envision plate reader (Perkin Elmer) accordingto the manufacturer's instructions. Excitation was from over a range of245-395 nm, and emission 1 was detected at (657.5-672.5) nm and emission2 detected at (606.5-623.5) nm. The HTRF ratio was calculated using theformula: [emission 1/emission 2]*10000.

Background signals were calculated from well without protein added. Thebackground subtracted signals were converted to % binding relative toDMSO controls. Data were analyzed using GraphPad Prism 4 software withthe settings: “sigmoidal dose-response (variable slope)”; 4 parameterswith Hill Slope (Constraints: Bottom=Constant equal to 0; Top=Must beless than 120).

The results are shown in Table 21. Key: N.D.=not determined.

TABLE 21 Inhibition of Labeled Tracer Binding to SOS1 by ExemplaryCompounds of Formula (I) Example No. IC₅₀ (nM) 1-1 61 1-2 35 1-3 2.3 1-42.1 1-5 2.5 1-6 6.8 1-7 2.1 1-8 1.6 1-9 2.3  1-10 2.3  1-11 >10000  1-12664  1-13 31  1-14 25  1-15 2.7  1-16 1.6  1-17 6.2  1-18 0.73  1-19 2.6 1-20 145  1-21 1.8  1-22 1.7  1-23 2.4 2-1 N.D. 2-2 13 2-3 10 2-4 47.63-1 5.2 3-2 3.6 3-3 2.3 3-4 129 3-5 4 3-6 133 4-1 6.5 4-2 6.3 4-3 4.54-4 2.5 5-1 7.2 5-2 5.9

Example B

This Example illustrates that exemplary compounds of the presentinvention bind to SOS1 and prevent a labeled tracer ligand fromoccupying the S0S1 binding site.

The ability of a compound of Formula (I) to bind to SOS1 was measuredusing a HTRF displacement assay. A recombinant human SOS1 polypeptide(corresponding to amino acids 560-1049, expressed in E. Coli withN-terminal His-TEV-AviTag-SOS1 (MW=59.4 kDa) and lanthanide labeledstreptavidin (CisBio) was incubated with an exemplary compound ofFormula (I) (in a DMSO stock solution) in buffer (25 mM HEPES pH 7.5, 25mM NaCl, 1 mM DTT, 0.01% Brij 35, 0.02% BSA, 0.1% DMSO). After a 10-15minute incubation at room temperature, a solution comprised of acustom-made Cy5 labelled tracer and MAb Anti-6HIS Tb cryptate Gold(Cisbio 61HI2TLA) in buffer was added to the solution containing theSOS1 polypeptide and exemplary compound of Formula (I). After a 1-hourincubation at room temperature, the HTRF signal was measured usingClairostar plate reader (BMG Labtech) according to the manufacturer'sinstructions. Excitation filter EX-TR was used, and emission 1 wasdetected at 650-610 nm and emission 2 detected at 620-610 nm. The HTRFratio was calculated using the formula: [emission 1/emission 2]*10000.

Background signals were calculated from well with a 10 μM inhibitor,known to inhibit 100% at that concentration. The background subtractedsignals were converted to % binding relative to DMSO controls. Data wereanalyzed using XLFIT software (IDBS) using a Morrison equation forcompetitive binding and Ki's were generated compound of Formula (I).

The results are shown in Table 22.

TABLE 22 Inhibition of Labeled Tracer Binding to SOS1 by ExemplaryCompounds of Formula (I) Example No. K_(i) (nM) 1-24  1-25  0.95 1-26 1.16 1-27  1-28  0.17 1-29  0.51 1-30  1-31  1-32  0.42 1-33  0.70 1-34 0.45 1-35  0.47 1-36  1-37  0.25 1-38  0.50 1-39  1-40  0.27 1-41  1-42 1-43  1.36 1-44  0.42 1-45  0.42 1-46  1-47  2.08 1-48  0.56 1-49  1-50 2-5  1.78 2-6  2.10 2-7  2-8  2.99 2-9  2-10  1.72 2-11  2.83 2-12  5.755-3  390.50 5-4  47.90 6-1  0.11 6-2  1.35 6-3  0.02 6-4  0.11 6-5  0.126-6  0.11 6-7  0.29 6-8  39.20 6-9  0.24 6-10  <0.01 6-11  9.10 6-12 0.88 6-13  0.29 6-14  5.51 6-15  12.55 6-16  10.07 6-17  56.45 6-18 316.70 6-19  2.32 7-1  0.40 7-2  0.33 7-3  0.32 7-4  0.47 7-5  0.82 7-6 1.41 7-7  0.92 8-1  1.38 8-2  3.74 9-1  109.00 9-2  0.93 10-1   3.0710-2   14.90 10-3   0.71 10-4   0.08 10-5   <0.01 10-6   0.64 10-7  0.07 10-8   0.09 10-9   0.05 10-10   0.01 10-11   0.01 10-12   0.4010-13   0.49 10-14   10-15   10-16   7.75 10-17   10-18   1.41 10-19  0.28 10-20   10-21   10-22   0.45 10-23   0.42 10-24   1.34 10-25   1.4710-26   0.47 10-27   0.46 10-28   0.45 10-29   0.39 10-30   0.41 10-31  0.35 10-32   0.20 10-33   0.69 10-34   0.56 10-35   0.31 10-36   0.2310-37   0.24 10-38   0.71 10-39   1.49 10-40   0.43 10-41   0.52 10-42  0.31 10-43   1.13 10-44   0.51 10-45   2.16 10-46   1.13 10-47   1.1910-48   1.35 10-49   0.56 10-50   3.74 10-51   1.40 10-52   44.4510-53   10-54   1.34 10-55   0.76 10-56   1.59 10-57   0.75 10-58   5.7810-59   30.91 10-60   2.00 10-61   1.61 10-62   0.90 10-63   0.5410-64   1.70 10-65   0.95 10-66   0.78 10-67   2.57 10-68   0.75 10-69  3.07 10-70   0.89 10-71   0.39 10-72   46.10 10-73   0.63 10-74   4.2610-75   6.51 10-76   3.44 10-77   0.75 10-78   1.16 10-79   4.15 10-80  5.75 10-81   0.90 10-82   0.86 10-83   4.54 10-84   2.01 10-85   0.7810-86   1.51 10-87   11-1   0.01 11-2   <0.01 11-3   <0.01 11-4   0.0111-5   0.01 11-6   0.42 12-1   0.20 12-2   0.60 12-3   0.74 12-4  12-5   12-6   0.87 12-7   0.40 12-8   1.14 12-9   0.47 12-10   1.7812-11   8.76 12-12   21.64 12-13   1.57 12-14   0.55 12-15   0.2512-16   0.87 12-17   0.46 12-18   0.62 12-19   1.00 12-20   1.60 12-21  1.32 12-22   1.24 12-23   1.05 12-24   1.24 12-25   2.41 12-26   0.4512-27   2.81 12-28   1.53 12-29   1.67 12-30   2.63 12-31   1.02 12-32  0.97 12-33   0.30 12-34   4.24 12-35   3.78 12-36   0.99 12-37   0.8512-38   1.29 12-39   0.91 12-40   0.64 12-41   40.24 12-42   0.7912-43   3.38 12-44   1.16 12-45   3.78 12-46   0.92 12-47   38.6912-48   16.96 12-49   39.66 12-50   3.02 12-51   0.79 12-52   1.0612-53   0.83 12-54   5.37 12-55   3.10 12-56   31.09 12-57   92.1712-58   14.62 12-59   0.47 12-60   0.25 12-61   1.68 12-62   12-63  0.83 12-64   0.51 12-65   0.72 12-66   2.10 12-67   0.36 12-68   0.3712-69   0.93 12-70   0.68 12-71   4.48 12-72   4.39 12-73   1.67 12-74  10.48 12-75   13.99 12-76   1.06 12-77   28.51 12-78   2.66 12-79  36.27 12-80   37.38 12-81   28.98 12-82   20.95 12-83   50.64 12-84  43.44 12-85   27.62 12-86   0.98 12-87   3.17 12-88   2.03 12-89   0.2512-90   12-91   12-92   12-93   12-94   12-95   12-96   12-97   12-98  19.04 12-99   0.93 12-100  1.07 12-101  1.45 12-102  0.25 12-103  10.9312-104  6.10 12-105  10.89 12-106  11.05 12-107  35.65 12-108  22.1112-109  2.61 12-110  3.54 12-111  8.09 12-112  2.20 12-113  2.62 12-114 69.26 12-115  1.66 12-116  12-117  12-118  12-119  12-120  49.78 12-121 39.24 12-122  170.30 12-123  50.43 12-124  64.46 12-125  10.29 12-126 14.04 12-127  6.08 12-128  12-129  12-130  12-131  3.6 12-132  1112-133  11.5 12-134  7.1 13-1   2.77 13-2   191.10 13-3   12.23 14-1  8.97 14-2   14-3   14.46 14-4   8.55 14-5   2.54 14-6   2.56 15-1   3.3715-2   0.42 15-3   0.94 16-1   14.42 16-2   19.40 16-3   13.41 16-4  10.41 16-5   5.50 16-6   6.50 16-7   78.79 16-8   21.24 16-9   35.6216-10   81.01 16-11   107.50 16-12   9.58 16-13   25.82 16-14   1.7117-1   4.33 17-2   12.47 17-3   12.80 17-4   14.39 18-1   0.98 18-2  5.27 18-3   1.37 18-4   1.64 19-1   6.16 19-2   95.00 19-3   19.2820-1   0.92 20-2   0.75 20-3   0.92 20-5   0.40 21-1   2.93 21-2   1.6721-3   14.41 21-4   13.69 21-5   1.34 21-6   0.93 21-7   0.71 21-8  3.17 21-9   2.10 21-10   5.73 21-11  

As shown in Table 22, exemplary compounds of the present inventionpotently inhibited the binding of a SOS1 labeled tracer to SOS1 protein.

Example C

This Example illustrates that exemplary compounds of the presentinvention bind to SOS1 and inhibit the SOS1-mediated nucleotide exchangeof mantGDP (preloaded into human KRAS) with GTP within a recombinanthuman KRAS.

The ability of an exemplary compound of Formula (I) to bind to SOS1 andinhibit the nucleotide exchange of mantGDP with GTP within recombinanthuman KRAS was measured using a fluorescence assay. Recombinant humanSOS1 polypeptide (corresponding to amino acids 564-1049, expressed in E.coli with a C-terminal StrepII tag. MW=60.59 kDa) in buffer (40 mM HEPES7.4, 10 mM MgCl2, 1 mM DTT, 0.002% Triton X100, 0.1% DMSO) was incubatedwith an exemplary compound of Formula (I) (in a DMSO stock solution) atroom temperature for 15 minutes. A mixture of preloaded mantGDPrecombinant human KRAS polypeptide (corresponding to amino acids 2-169,expressed in E. coli with an N-terminal TEV cleavable his-tag. MW 21.4kDa) and GTP was incubated for 5 minutes in buffer (40 mM HEPES 7.4, 10mM MgCl2, 1 mM DTT 0.002%, Triton X100, 0.1% DMSO) at room temperature,then added to the SOS1/compound mixture. Reaction progress was monitoredat room temperature for 60 minutes using a Clariostar plate reader(excitation 370±15 nm, emission 450±20 nm) according to themanufacturer's instructions. The slope of the linear portion of theprogress curve was calculated using a Clariostar software. Typicalanalysis interval was 8-30 minutes. Background signals were calculatedfrom well without protein added. The background subtracted signals wereconverted to % activity relative to DMSO controls. Data were analyzedusing GraphPad Prism 4 software with the settings: “sigmoidaldose-response (variable slope)”; 4 parameters with Hill Slope(Constraints: Bottom=Constant equal to 0; Top=Must be less than 120).

The fluorescence readout IC₅₀ for exemplary compounds of Formula (I) isshown in Table 23.

TABLE 23 Example No. IC₅₀(nM) 1-1 35 1-2 20 1-4 7 1-5 9 1-6 12 1-7 8 1-88 1-9 7  1-10 9

As shown in Table 23, exemplary compounds of the present invention werecapable of potently inhibiting SOS1-mediated GTP nucleotide exchange byblocking mant-GDP exchange.

Example D

This Example illustrates that exemplary compounds of the presentinvention prevent KRas-mediated GTP nucleotide exchange mediated by SOS1to inhibit KRas activity thereby inhibiting the generation of thedownstream effector pERK.

MKN1 cells (15,000/w) or H358 (30,000/w) were seeded in a black clearflat bottom 96-well cell culture plate (Corning, #3904) and incubated at37° C. overnight. Assay day 1, cells were dosed with compounds ofFormula (I) with a 10 μm starting concentration and serially diluted 3×for a total of 9 concentrations. The cells were incubated forapproximately 0.5-1 hour with the compounds solubilized in DMSO at 37°C. Cells were immediately fixed by adding 50 μL of 4% formaldehyde toall wells in a fume hood and the plates were incubated for 20 minutes atroom temperature. The formaldehyde was discarded from the plates and 150μL of ice-cold methanol was added to permeabilize the cells for 10minutes at −20° C. The methanol was discarded from each of the platesand any liquid remaining in the plate by tapping the plate against papertowels. Cells were then blocked with 150 μL of Odyssey blocking buffer(LI-COR Biosciences #927-50010) using 0.05% Tween for 1 hour at roomtemperature on a shaker. The blocking buffer was discarded and 50 μL ofprimary antibodies pERK (cell signaling Technology #9101L; Rabbit,1:500) and GapDH (Millipore #MAB34; Mouse, 1:5000) diluted in Odysseyblocking buffer was added. The plates were incubated overnight at 4° C.on a shaker.

On Assay day 2, the primary antibody solution was removed. Each platewas washed 3× times with 150 μL of 1×PBST (PBS+0.1% Tween 20) andincubated with 50 μL of secondary antibodies: Anti-Rabbit (LI-CORBiosciences #926-32211) and Anti-Mouse (LI-COR Biosciences #68070) at1:800 dilution in Odyssey blocking buffer with Tween at room temperatureon a shaker for 2 hours (protected from light). The secondary antibodysolution as removed and each plate was washed with PBST 3× times. Anyliquid remaining was discarded and the plate was imaged using the LicorOdyssey machine according to the manufacturer's instruction, using a setfocus length at 3 mm and both 800 nm and 700 nm filters. The GAPDHnormalized scan values for each well were divided by the average ofvehicle wells to get the % of pERK inhibition. The IC50 values were thencalculated with the Graph pad Prism software.

The results are shown in Table 24. Key: N.D.=not determined.

TABLE 24 Example No. IC₅₀ (nM)  1-2 1050  1-3 52  1-4 134  1-5 60  1-654  1-7 31  1-8 66  1-9 90   1-10 132   1-11 >10,000   1-12 3965   1-13378   1-14 165   1-15 24   1-16 348   1-17 414   1-18 58   1-19 116  1-20 3739   1-21 187   1-22 70   1-23 58   1-24 25   1-25 47   1-26 57  1-27 61   1-28 61   1-29 71   1-30 79   1-31 83   1-32 101   1-33 109  1-34 119   1-35 123   1-36 125   1-37 131   1-38 136   1-39 170   1-40171   1-41 195   1-42 201   1-43 216   1-44 235   1-45 335   1-46 341  1-47 349   1-48 364   1-49 426   1-50 453  2-1 308  2-2 118  2-3 45 2-4 1929  2-5 82  2-6 83  2-7 142  2-8 148  2-9 172   2-10 223   2-11243   2-12 304  3-1 128  3-2 69  3-3 20  3-4 1059  3-5 4218  3-6 4259 4-1 327  4-2 131  4-3 71  4-4 130  5-1 669  5-2 120  5-3 N.D.  5-4 1623 6-1 79  6-2 100  6-3 12  6-4 47  6-5 10  6-6 40  6-7 74  6-8 N.D.  6-948   6-10 271   6-11 31   6-12 30   6-13 20   6-14 320   6-15 172   6-16333   6-17 412   6-18 3696   6-19 242  7-1 79  7-2 73  7-3 28  7-4 14 7-5 110  7-6 110  7-7 115  8-1 164  8-2 605  9-1 >10,000  9-2 176 10-1183 10-2 1366 10-3 85 10-4 14 10-5 108 10-6 21 10-7 22 10-8 34 10-9 54 10-10 17  10-11 22  10-12 29  10-13 39  10-14 1150  10-15 844  10-16325  10-17 2629  10-18 291  10-19 69  10-20 1646  10-21 444  10-22 38 10-23 19  10-24 69  10-25 103  10-26 164  10-27 154  10-28 161  10-2970  10-30 48  10-31 3585  10-32 28  10-33 275  10-34 136  10-35 1000 10-36 79  10-37 55  10-38 29  10-39 110  10-40 11  10-41 30  10-42 43 10-43 138  10-44 53  10-45 57  10-46 157  10-47 55  10-48 75  10-49 107 10-50 205  10-51 39  10-52 286  10-53  10-54 48  10-55 76  10-56 26 10-57 46  10-58 52  10-59 570  10-60 961  10-61 57  10-62 76  10-63 50 10-64 513  10-65 23  10-66 108  10-67 44  10-68 36  10-69 39  10-70 15 10-71 19  10-72 466  10-73 49  10-74 65  10-75 56  10-76 85  10-77 102 10-78 114  10-79 16  10-80  10-81  10-82 52  10-83  10-84  10-85 18 10-86 21  10-87 11-1 10 11-2 27 11-3 48 11-4 25 11-5 12 11-6 55 12-1 512-2 9 12-3 30 12-4 370 12-5 850 12-6 522 12-7 66 12-8 38 12-9 10  12-1046  12-11 142  12-12 249  12-13 39  12-14 17  12-15 17  12-16 11  12-1717  12-18 37  12-19 59  12-20 62  12-21 57  12-22 89  12-23 46  12-24 38 12-25 35  12-26 27  12-27 14  12-28 17  12-29 16  12-30 54  12-31 70 12-32 18  12-33 55  12-34 51  12-35 35  12-36 12  12-37 32  12-38 97 12-39 75  12-40 24  12-41 1274  12-42 27  12-43 44  12-44 38  12-45 250 12-46 37  12-47 307  12-48 114  12-49 161  12-50 25  12-51 48  12-52 60 12-53 47  12-54 45  12-55 59  12-56 301  12-57 1857  12-58 38  12-59 19 12-60 24  12-61 21  12-62  12-63  12-64 29  12-65 16  12-66 77  12-67 12-68  12-69  12-70 13  12-71  12-72 19  12-73  12-74  12-75 87  12-7656  12-77  12-78 94  12-79 173  12-80 295  12-81  12-82 330  12-83 749 12-84 280  12-85 602  12-86  12-87  12-88  12-89  12-90  12-91  12-92 12-93  12-94  12-95  12-96  12-97  12-98  12-99   12-100   12-101 22  12-102   12-103 107   12-104 92   12-105 97   12-106 114   12-107  12-108   12-109   12-110   12-111   12-112   12-113   12-114   12-11519   12-116   12-117   12-118   12-119   12-120   12-121   12-122  12-123   12-124 856   12-125 114   12-126   12-127   12-128   12-129  12-130   12-131 28   12-132 76   12-133 97   12-134 13-1 149 13-2 206813-3 195 14-1 68 14-2 139 14-3 14-4 89 14-5 70 14-6 142 15-1 28 15-2 815-3 34 16-1 245 16-2 284 16-3 208 16-4 371 16-5 71 16-6 239 16-7 290416-8 93 16-9 643  16-10 919  16-11  16-12  16-13 >10000  16-14 37 17-130 17-2 50 17-3 188 17-4 116 18-1 128 18-2 380 18-3 18-4 41 19-1 15619-2 779 19-3 114 20-1 11 20-2 8 20-3 16 20-5 21-1 77 21-2 137 21-3 22121-4 118 21-5 1114 21-6 176 21-7 26 21-8 90 21-9 54  21-10 58  21-11

The results in Table 24 illustrate that the compounds of the presentinvention are capable of potently inhibiting KRas-mediated activationand formation of pERK thereby blocking intracellular KRas-mediatedsignaling.

Example E

This Example illustrates that exemplary compounds of the presentinvention prevent KRas-mediated GTP nucleotide exchange mediated bySOS1, in a SOS1 N233Y mutant cell line, to inhibit KRas activity therebyinhibiting the generation of the downstream effector Perk.

Three cell lines harboring SOS1 N233Y activation mutations, LXF289(DSMZ, Leibniz Institute, Germany) RL95-2 (ATCC CRL-1671); and OCI AML-5(DSMZ, Leibniz Institute, Germany) were used in the studies. SOS1 N233Ymutant cells (15,000/w) were seeded in a black clear flat bottom 96-wellcell culture plate (Corning, #3904) and incubated at 37° C. overnight.Assay day 1, cells were dosed with compounds of Formula (I) with a 10 μmstarting concentration and serially diluted 3× for a total of 9concentrations. The cells were incubated for 1 hour with the compoundssolubilized in DMSO at 37° C. Cells were immediately fixed by adding 50μL of 4% formaldehyde to all wells in a fume hood and the plates wereincubated for 20 minutes at room temperature. The formaldehyde wasdiscarded from the plates and 150 μL of ice-cold methanol was added topermeabilize the cells for 10 minutes at −20° C. The methanol wasdiscarded from each of the plates and any liquid remaining in the plateby tapping the plate against paper towels. Cells were then blocked with150 μL of Odyssey blocking buffer (LI-COR Biosciences #927-50010) using0.05% Tween for 1 hour at room temperature on a shaker. The blockingbuffer was discarded and 50 μL of primary antibodies pERK (cellsignaling Technology #9101L; Rabbit, 1:500) and GapDH (Millipore #MAB34;Mouse, 1:5000) diluted in Odyssey blocking buffer was added. The plateswere incubated overnight at 4° C. on a shaker.

On Assay day 2, the primary antibody solution was removed. Each platewas washed 3× times with 150 μL of 1×PBST (PBS+0.1% Tween 20) andincubated with 50 μL of secondary antibodies: Anti-Rabbit (LI-CORBiosciences #926-32211) and Anti-Mouse (LI-COR Biosciences #68070) at1:800 dilution in Odyssey blocking buffer with Tween at room temperatureon a shaker for 2 hours (protected from light). The secondary antibodysolution as removed and each plate was washed with PBST 3× times. Anyliquid remaining was discarded and the plate was imaged using the LicorOdyssey machine according to the manufacturer's instruction, using a setfocus length at 3 mm and both 800 nm and 700 nm filters. The GAPDHnormalized scan values for each well were divided by the average ofvehicle wells to get the % of pERK inhibition. The IC50 values were thencalculated with the Graph pad Prism software.

The results are shown in Table 25.

TABLE 25 Cell Line Example No. IC₅₀ (nM) LXF289 6-10 294 6-11 41 RL95-26-10 214 6-11 20 OCI AML-5 6-10 333 6-11 32

The results in Table 25 illustrate that the compounds of the presentinvention are capable of potently inhibiting KRas-mediated activationand formation of pERK in cells harboring a SOS1 activating mutationthereby blocking intracellular KRas-mediated signaling driven byincreased SOS1 activity.

Example F

This Example illustrates that exemplary compounds of the presentinvention prevent increased KRas-mediated GTP nucleotide exchangemediated by SOS1 in NF-1 mutant cell lines to inhibit KRas activitythereby inhibiting the generation of the downstream effector pERK.

Two cell lines harboring activating mutations in NF-1 gene, Kasuma-1(ATCC CRL-2724; and NCI-H1435 (ATCC CRL-5870), were employed in thesestudies. NF-1 mutant cells (15,000/w) were seeded in a black clear flatbottom 96-well cell culture plate (Corning, #3904) and incubated at 37°C. overnight. Assay day 1, cells were dosed with compounds of Formula(I) with a 10 μm starting concentration and serially diluted 3× for atotal of 9 concentrations. The cells were incubated for 1 hour with thecompounds solubilized in DMSO at 37° C. Cells were immediately fixed byadding 50 μL of 4% formaldehyde to all wells in a fume hood and theplates were incubated for 20 minutes at room temperature. Theformaldehyde was discarded from the plates and 150 μL of ice-coldmethanol was added to permeabilize the cells for 10 minutes at −20° C.The methanol was discarded from each of the plates and any liquidremaining in the plate by tapping the plate against paper towels. Cellswere then blocked with 150 μL of Odyssey blocking buffer (LI-CORBiosciences #927-50010) using 0.05% Tween for 1 hour at room temperatureon a shaker. The blocking buffer was discarded and 50 μL of primaryantibodies pERK (cell signaling Technology #9101L; Rabbit, 1:500) andGapDH (Millipore #MAB34; Mouse, 1:5000) diluted in Odyssey blockingbuffer was added. The plates were incubated overnight at 4° C. on ashaker.

On Assay day 2, the primary antibody solution was removed. Each platewas washed 3× times with 150 μL of 1×PBST (PBS+0.1% Tween 20) andincubated with 50 μL of secondary antibodies: Anti-Rabbit (LI-CORBiosciences #926-32211) and Anti-Mouse (LI-COR Biosciences #68070) at1:800 dilution in Odyssey blocking buffer with Tween at room temperatureon a shaker for 2 hours (protected from light). The secondary antibodysolution as removed and each plate was washed with PBST 3× times. Anyliquid remaining was discarded and the plate was imaged using the LicorOdyssey machine according to the manufacturer's instruction, using a setfocus length at 3 mm and both 800 nm and 700 nm filters. The GAPDHnormalized scan values for each well were divided by the average ofvehicle wells to get the % of pERK inhibition. The IC₅₀ values were thencalculated with the Graph pad Prism software.

The results are shown in Table 26.

TABLE 26 Cell Line Example No. IC₅₀ (nM) Kasumi  6-10 902  6-11 97 H14356-3 25 6-4 51 6-5 9 6-6 29 6-9 52  6-10 542  6-11 65  6-12 63 7-3 55 7-483 10-4  33 10-6  75 10-7  87 10-8  94 10-9  152 10-10 15 10-11 63 11-1 6 11-2  17 11-3  62 11-4  19

The results in Table 26 illustrate that the compounds of the presentinvention are capable of potently inhibiting KRas-mediated activationand formation of pERK in cells harboring NF-1 activating mutationsthereby blocking intracellular KRas-mediated signaling driven by NF-1driven increased SOS1 activity.

While the invention has been described in connection with specificembodiments thereof, it will be understood that it is capable of furthermodifications and this application is intended to cover any variations,uses, or adaptations of the invention following, in general, theprinciples of the invention and including such departures from thepresent disclosure as come within known or customary practice within theart to which the invention pertains and as may be applied to theessential features hereinbefore set forth, and as follows in the scopeof the appended claims.

We claim:
 1. A compound of Formula (I):

or a pharmaceutically acceptable salt thereof, wherein: R¹ is hydrogen,hydroxyl, C1-C6 alkyl, alkoxy, —N(R⁶)₂, —NR⁶C(O)R⁶, —C(O)N(R⁶)₂,—SO₂alkyl, —SO₂NR⁶alkyl, cycloalkyl, -Q-heterocyclyl, aryl, orheteroaryl, wherein the cycloalkyl, the heterocyclyl, the aryl, and theheteroaryl are each optionally substituted with one or more R² or L-R²;each Q is independently a bond, O, or NR⁶; X is N; each R² isindependently C1-C3 alkyl, oxo, hydroxy, halogen, cyano, hydroxyalkyl,haloalkyl, alkoxy, —C(O)N(R⁶)₂, —N(R⁶)₂, —SO₂alkyl, —NR⁶C(O)C1-C3 alkyl,—C(O)cycloalkyl, —C(O)C1-C3 alkyl, —C(O)heterocyclyl, aryl, heteroarylor heterocyclyl, wherein the cycloalkyl, the heterocyclyl, the aryl, theheteroaryl or the heterocyclyl are each optionally substituted with oneor more R¹¹; R³ is hydrogen, C1-C6 alkyl, alkoxy, —N(R¹⁰)₂, -L-N(R¹⁰)₂,cycloalkyl, haloalkyl or heterocyclyl, wherein the C1-C6 alkyl, thecycloalkyl and the heterocyclyl, are each optionally substituted withone or more R⁹; Y is a bond or heteroarylene; R⁴ is aryl or heteroaryl,each optionally substituted with one or more R⁵; each R⁵ isindependently hydroxy, halogen, cyano, hydroxyalkyl, alkoxy, C1-C3alkyl, haloalkyl, haloalkyl-OH, —N(R⁶)₂, -L-N(R⁶)₂ or —SO₂alkyl; L isC1-C3 alkylene; each R⁶ is independently hydrogen, C1-C3 alkyl,haloalkyl, or cycloalkyl; R⁷ is hydrogen, cyano, CF₃, F, or alkoxy; R⁸is C1-C2 alkyl or halo-C1-C2 alkyl; each R⁹ is independently hydroxy,halogen, amino, cyano, alkoxy, or C1-C3 alkyl; each R¹⁰ is independentlyhydrogen, C1-C3 alkyl or cycloalkyl; each R¹¹ is independently C1-C3alkyl, halogen or haloalkyl; and R¹² is hydrogen, halogen or C1-C3alkyl.
 2. The compound according to claim 1, wherein R¹ is alkoxy or-Q-heterocyclyl, wherein the heterocyclyl is optionally substituted withone or more R² or L-R².
 3. The compound according to claim 2, wherein R¹is -Q-heterocyclyl, and wherein Q is a bond or —O— and the heterocyclylis morpholinyl, piperazinyl, or piperazinone.
 4. The compound accordingto claim 3, wherein R¹ is -Q-heterocyclyl, and wherein the heterocyclylis bridged morpholinyl, bridged piperazinyl, or bridged piperazinone. 5.The compound according to claim 2, wherein R¹ is -Q-heterocyclyl, andwherein the heterocyclyl is spirocyclic ring system containing two ormore rings.
 6. The compound according to claim 5, wherein thespirocyclic ring system comprises two rings each containing aheteroatom.
 7. The compound according to claim 5, wherein thespirocyclic ring system contains a ring with no heteroatom.
 8. Thecompound according to claim 1, wherein R¹ is heteroaryl, wherein theheteroaryl is optionally substituted with one or more R² or L-R².
 9. Thecompound according to claim 8, wherein the heteroaryl is a bicyclic ortricyclic ring system comprising a non-aromatic ring.
 10. The compoundaccording to claim 9, wherein the bicyclic or tricyclic ring system is5,6,7,8-tetrahydro-[1,2,4]triazolopyrazinyl,5,6,7,8-tetrahydroimidazopyrazinyl, 2,4,5,6-tetrahydropyrrolopyrazolyl,1,2,3,4-tetrahydrobenzo[4,5]imidazopyrazinyl or4,5,6,7-tetrahydropyrazolopyrazinyl.
 11. The compound according to claim1, wherein R¹ is hydrogen.
 12. The compound according to claim 1,wherein R¹ is hydroxyl.
 13. The compound according to claim 1, whereinR¹ is —N(R⁶)₂.
 14. The compound according to claim 1, wherein R¹ is—NR⁶C(O)R⁶.
 15. The compound according to claim 1, wherein R¹ is—C(O)N(R⁶)₂.
 16. The compound according to claim 1, wherein R¹ iscycloalkyl optionally substituted with one or more R².
 17. The compoundaccording to claim 16, wherein the cycloalkyl is cyclobutyl, cyclopentylor cyclohexyl, each optionally substituted with one or more R².
 18. Thecompound according to claim 17, wherein the cyclobutyl, cyclopentyl orthe cyclohexyl are substituted with one R², wherein R² is C1-C3 alkyl,alkoxy, halogen, hydroxyl or —N(R⁶)₂.
 19. The compound according toclaim 1, wherein R¹ is -Q-heterocyclyl optionally substituted with oneor more R².
 20. The compound according to claim 19, wherein Q is a bondand the heterocyclyl is morpholinyl, piperdinyl, piperazinyl,N-methylpiperazinyl, piperazin-2-one, 1-methyl-piperazin-2-one,diazepanyl, 6,6-difluoro-1,4-diazepan-1-yl, or 4-methylthiomorpholine1,1-dioxide.
 21. The compound according to claim 19, wherein Q is a bondand the heterocyclyl is pyrrolidinyl or tetrahydropyranyl, eachoptionally substituted with one or more R².
 22. The compound accordingto claim 21, wherein the pyrrolidinyl or the tetrahydropyranyl aresubstituted with one R², wherein R² is C1-C3 alkyl, alkoxy, hydroxyl or—N(R⁶)₂.
 23. The compound according to claim 20, wherein Q is a bond andthe heterocyclyl is piperazinyl optionally substituted with one or moreR².
 24. The compound according to claim 23, wherein the piperazinyl issubstituted with one R², wherein R² is heteroaryl, —C(O)cycloalkyl or—C(O)heterocyclyl, wherein the heteroaryl, or the cycloalkyl orheterocyclyl portion of the —C(O)cycloalkyl or —C(O)heterocyclyl areeach optionally substituted with one or more R¹¹.
 25. The compoundaccording to claim 24, wherein R² is —C(O)cycloalkyl, wherein thecycloalkyl is cyclopropyl substituted with one R¹¹, wherein R¹¹ is C1-C3alkyl.
 26. The compound according to claim 24, wherein R² is—C(O)cycloalkyl, wherein the cycloalkyl is cyclopropyl substituted withone R¹¹, wherein R¹¹ is haloalkyl.
 27. The compound according to claim24, wherein R² is —C(O)heterocyclyl, wherein the heterocyclyl isoxetanyl, tertrahydrofuranyl, or tetrahydropyranyl.
 28. The compoundaccording to claim 19, wherein Q is a bond and the heterocyclyl is abicyclic heterocyclyl.
 29. The compound according to claim 28, whereinthe bicyclic heterocylyl is diazabicyclo[3.2.0]heptan-2-yl,(1R,5R)-2,6-diazabicyclo[3.2.0]heptan-2-yl,diazabicyclo[3.2.0]heptan-6-yl,(1R,5R)-2,6-diazabicyclo[3.2.0]heptan-6-yl,6,7-dihydropyrazolo[1,5-a]pyrazin-5(4H)-yl,5,6-dihydroimidazo[1,5-a]pyrazin-7(8H)-yl,1,3-dimethyl-5,6-dihydroimidazo[1,5-a]pyrazin-7(8H)-yl or(R)-2-methylhexahydropyrrolo[1,2-a]pyrazin-6(2H)-one.
 30. The compoundaccording to claim 19, wherein Q is O and the heterocyclyl isazetidinyl, tetrahydrofuranyl, pyrrolidinyl, or piperdinyl.
 31. Thecompound according to claim 1, wherein R¹ is aryl optionally substitutedwith one or more R².
 32. The compound according to claim 31, wherein thearyl is phenyl optionally substituted with one or more R².
 33. Thecompound according to claim 32, wherein the phenyl is substituted withone R², wherein R² is C1-C3 alkyl, alkoxy, hydroxyl or —N(R⁶)₂.
 34. Thecompound according to claim 1, wherein R¹ is heteroaryl optionallysubstituted with one or more R².
 35. The compound according to claim 34,wherein the heteroaryl is pyrazolyl optionally substituted with one ormore R².
 36. The compound according to claim 35, wherein the pyrazolylis substituted with one R², wherein R² is C1-C3 alkyl, alkoxy, hydroxylor —N(R⁶)₂.
 37. The compound according to claim 1, wherein R⁷ is cyanoor alkoxy.
 38. The compound according to claim 37, wherein R⁷ is alkoxy,and the alkoxy is methoxy.
 39. The compound according to claim 38,wherein R¹ is alkoxy.
 40. The compound according to claim 39, whereinthe alkoxy is methoxy.
 41. The compound according to claim 1, wherein Yis heteroarylene.
 42. The compound according to claim 41, wherein theheteroarylene is thiophenylene.
 43. The compound according to claim 1,wherein Y is a bond.
 44. The compound according to claim 1, wherein R⁴is heteroaryl, optionally substituted with one or more R⁵.
 45. Thecompound according to claim 44, wherein R⁴ is aryl optionallysubstituted with one or more R⁵.
 46. The compound according to claim 45,wherein the aryl is phenyl optionally substituted with one or more R⁵.47. The compound according to claim 46, wherein the phenyl issubstituted with one R⁵, wherein R⁵ is C1-C4 alkyl, haloalkyl or-L-N(R⁶)₂.
 48. The compound according to claim 47, wherein R⁵ is-L-N(R⁶)₂, wherein L is methylene and one R⁶ is hydrogen and the secondR⁶ is C1-C3 alkyl.
 49. The compound according to claim 48, wherein thesecond R⁶ is methyl.
 50. The compound according to claim 49, wherein R⁵is -L-N(R⁶)₂, wherein L is methylene and each R⁶ is C1-C3 alkyl.
 51. Thecompound according to claim 50, wherein each C1-C3 alkyl is methyl. 52.The compound according to claim 46, wherein the phenyl is substitutedwith two R⁵, wherein one R⁵ is C1-C3 alkyl and the second R⁵ ishaloalkyl.
 53. The compound according to claim 52, wherein C1-C3 alkylis methyl and the haloalkyl is trifluoromethyl.
 54. The compoundaccording to claim 46, wherein the phenyl is substituted with two R⁵,wherein one R⁵ is C1-C3 alkyl and the second R⁵ is -L-N(R₆)₂.
 55. Thecompound according to claim 48, wherein C1-C3 alkyl is methyl, L ismethylene and each R⁶ is C1-C3 alkyl.
 56. The compound according toclaim 1, wherein R³ is C1-C6 alkyl.
 57. The compound according to claim56, wherein C1-C6 alkyl is methyl, ethyl or isopropyl.
 58. The compoundaccording to claim 1, wherein R³ is haloalkyl.
 59. The compoundaccording to claim 1, wherein R³ is cycloalkyl optionally substitutedwith halogen amino, hydroxy or alkoxy.
 60. The compound according toclaim 59, wherein the cycloalkyl is cyclopropyl.
 61. The compoundaccording to claim 1, wherein R³ is alkoxy.
 62. The compound accordingto claim 1, wherein R³ is —N(R¹⁰)₂.
 63. The compound according to claim1, wherein R³ is hydrogen.
 64. The compound according to claim 1,wherein R⁸ is C1-C2 alkyl.
 65. The compound according to claim 64,wherein the C1-C2 alkyl is methyl.
 66. The compound according to claim1, wherein R⁸ is haloC1-C2 alkyl.
 67. The compound according to claim66, wherein the haloC1-C2 alkyl is fluoromethyl, difluoromethyl ortrifluoromethyl.
 68. The compound of claim 1, wherein the compound isselected from the group consisting of:

and pharmaceutically acceptable salts thereof.
 69. A pharmaceuticalcomposition, comprising a therapeutically effective amount of a compoundof Formula (I) according to claim 1 or a pharmaceutically acceptablesalt or solvate thereof, and a pharmaceutically acceptable excipient.70. A compound of the following formula:

or a pharmaceutically acceptable salt thereof.
 71. A compound of thefollowing formula:


72. A pharmaceutically acceptable salt of a compound of the followingformula: